B.S.P.T.

British Standard Pipe Thread


British Standard Pipe Thread is a family of standard screw thread types that has been adopted internationally for interconnecting and sealing pipe ends by mating an external (male) with an internal (female) thread.


A list of 16 thread sizes are defined by the standards, ranging from 1⁄16 Inch to 6 Inch. The size was originally based on the inner diameter measured in inches of a steel tube for which the thread was intended. This often causes confusion, as people think the size refers to the outside diameter of the male thread.

Two types of threads are used:

Parallel (straight) threads, British Standard Pipe Parallel thread (BSPP)

Taper threads, British Standard Pipe Taper thread (BSPT)

Just to confuse things, often the T in BSPT refers to Thread and doesn't indicate either Taper or Parallel.

The threadform follows the British Standard Whitworth standard


The table below shows dimensions for male threads.


Thread

Threads per inch

Pitch mm

Outside Diameter mm

Outside Diameter inches

1/16 Inch

28

0.907

7.723

0.304

1/8 Inch

28

0.907

9.728

0.383

1/4 Inch

19

1.337

13.157

0.518

3/8 Inch

19

1.337

16.662

0.656

1/2 Inch

14

1.814

20.995

0.825

5/8 Inch

14

1.814

22.991

0.902

3/4 Inch

14

1.814

26.441

1.041

1 Inch

11

2.309

33.249

1.309

1¼ Inch

11

2.309

41.910

1.650

1½ Inch

11

2.309

47.803

1.882

2 Inch

11

2.309

59.614

2.347

2½ Inch

11

2.309

75.184

2.96

3 Inch

11

2.309

87.884

3.46

4 Inch

11

2.309

113.030

4.45

5 Inch

11

2.309

138.430

5.45

6 Inch

11

2.309

163.830

6.45


This is a 1/2 Inch thread, you can count 14 threads in one inch.


An end view of a 1/2 Inch male thread



As the name of the sizing does not match the actual diameter, there can be some confusion over sizing. We have shown some pictures of two of the more popular sizes along side popular UK coins.

First, a half inch thread which is similar in size to a 1 penny coin.



Second, a three quarter inch thread which is similar in size to a 2 pence coin :


Typical uses and sizes are :

1/4 Inch - Compressed air connections

3/8 Inch - Oil line connections

1/2 Inch - Basin and sink taps, radiator inlets, old outside tap outlets

5/8 Inch - Old outside tap outlets (very rare)

3/4 Inch - Bath taps, washing machine inlet hose connections, modern outside tap outlets

1 Inch Domestic heating boilers

1.25 Inch - Wash hand basin wastes (bathroom sink)

1.5 Inch - Kitchen sink wastes (kitchen sink), bath wastes, WC syphon outlets

2 Inch - Modern toilet flushvalve outlets


A selection of "Black Iron" BSPT fittings :

BSPT fittings


A selection of plumbing fittings with BSP threads : spesonline


1/2 Inch BSP Radiator Valve Tails (Pack of 2)
2.99
End date: Tuesday Dec-09-2014 16:21:35 GMT
Buy it now for only: £2.99
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1/4 Inch Brass Male x Female Elbow | ? BSP M x F
2.50
End date: Wednesday Dec-10-2014 12:03:59 GMT
Buy it now for only: £2.50
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Brass Washing Machine Y Piece | 3/4 Inch BSP
4.99
End date: Thursday Dec-18-2014 21:36:44 GMT
Buy it now for only: £4.99
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1/4 Inch Brass Flanged Plugs | ? BSP | British Standard Pipe Thread | 2 Pack
2.52
End date: Tuesday Dec-09-2014 9:51:24 GMT
Buy it now for only: £2.52
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1/4 Inch Brass Female x Female Elbow | ? BSP (F x F)
2.99
End date: Wednesday Dec-10-2014 14:54:45 GMT
Buy it now for only: £2.99
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3/8 Inch Brass Male x Female Elbow | 3/8? BSP (M x F)
2.80
End date: Monday Dec-08-2014 7:48:29 GMT
Buy it now for only: £2.80
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2 Inch BSP Brass Back Nut | British Standard Pipe Thread Fitting
9.04
End date: Sunday Dec-07-2014 10:09:01 GMT
Buy it now for only: £9.04
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1/2 Inch BSP Brass Socket | British Standard Pipe Thread Fitting
2.01
End date: Wednesday Dec-10-2014 12:24:28 GMT
Buy it now for only: £2.01
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1/2 Inch BSP Brass Plug | British Standard Pipe Thread Fitting
1.93
End date: Tuesday Dec-09-2014 21:49:23 GMT
Buy it now for only: £1.93
Buy it now  |  Add to watch list

6 Bar 1/2 Inch BSP Safety Valve / Water Pressure Relief Valve
6.03
End date: Tuesday Dec-09-2014 16:24:56 GMT
Buy it now for only: £6.03
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3/8 Inch BSP Brass Back Nut | British Standard Pipe Thread Fitting
1.59
End date: Friday Dec-12-2014 9:26:47 GMT
Buy it now for only: £1.59
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Plugs British Standard Pipe Thread (2 Pack)
2.54
End date: Wednesday Dec-10-2014 14:48:49 GMT
Buy it now for only: £2.54
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15mm x 3/4 Inch Male BSP Compression Coupler | Brass Fitting
2.95
End date: Saturday Dec-13-2014 9:26:30 GMT
Buy it now for only: £2.95
Buy it now  |  Add to watch list

10mm x 3/8 Inch BSP Compression Female Adaptor / Coupler | Brass Fitting
2.93
End date: Monday Dec-08-2014 20:47:43 GMT
Buy it now for only: £2.93
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8mm x 1/4 Inch Female BSP Compression Coupler | Brass Fitting
2.38
End date: Tuesday Dec-23-2014 21:11:56 GMT
Buy it now for only: £2.38
Buy it now  |  Add to watch list

1/2 Inch Brass Swing Check Valve | ? BSP | Non-Return Valve
5.42
End date: Wednesday Dec-10-2014 11:59:17 GMT
Buy it now for only: £5.42
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8mm x 1/4 Inch Male BSP Compression Elbow | Brass Fitting
1.38
End date: Thursday Dec-18-2014 8:11:38 GMT
Buy it now for only: £1.38
Buy it now  |  Add to watch list

1/4 Inch BSP Brass Equal Tee | British Standard Pipe Thread Fitting
3.91
End date: Wednesday Dec-03-2014 10:15:33 GMT
Buy it now for only: £3.91
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1 Inch BSP Brass Socket | British Standard Pipe Thread Fitting
3.98
End date: Wednesday Dec-10-2014 12:24:26 GMT
Buy it now for only: £3.98
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22mm x 1 Inch BSP Male Compression Coupler | Brass Fitting
4.42
End date: Monday Dec-08-2014 9:21:48 GMT
Buy it now for only: £4.42
Buy it now  |  Add to watch list

15mm x 1/2 Inch Female BSP Chrome Plated Compression Elbow
3.56
End date: Tuesday Dec-23-2014 17:09:15 GMT
Buy it now for only: £3.56
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10mm x 3/8 Inch BSP Male Compression Coupler | Brass Fitting
1.76
End date: Tuesday Dec-09-2014 20:00:47 GMT
Buy it now for only: £1.76
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Male x Female Elbow (M x F) | British Standard Pipe Thread
3.54
End date: Wednesday Dec-10-2014 15:00:24 GMT
Buy it now for only: £3.54
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1 1/4 Inch Brass Flanged Plug | BSP - British Standard Pipe Thread Fitting
3.36
End date: Tuesday Dec-09-2014 21:37:30 GMT
Buy it now for only: £3.36
Buy it now  |  Add to watch list

1/2 Inch Brass Hex Nipple | BSP | British Standard Pipe Thread Fitting
1.91
End date: Sunday Dec-07-2014 10:09:10 GMT
Buy it now for only: £1.91
Buy it now  |  Add to watch list

1/2 Inch x 3/8 Inch Brass Hex Bush | BSP - British Standard Pipe Thread Fitting
1.00
End date: Wednesday Dec-10-2014 14:54:39 GMT
Buy it now for only: £1.00
Buy it now  |  Add to watch list

1 1/2 Inch Brass Flanged Plug | BSP - British Standard Pipe Thread Fitting
6.68
End date: Sunday Dec-07-2014 11:52:23 GMT
Buy it now for only: £6.68
Buy it now  |  Add to watch list

10mm x 3/8 Inch Male BSP Compression Elbow | Brass Fitting
1.84
End date: Tuesday Dec-23-2014 20:01:41 GMT
Buy it now for only: £1.84
Buy it now  |  Add to watch list

10mm x 1/4 Inch Male BSP Compression Coupler | Brass Fitting
1.80
End date: Wednesday Dec-10-2014 11:19:48 GMT
Buy it now for only: £1.80
Buy it now  |  Add to watch list

10mm x 3/8 Inch Female BSP Compression Elbow | Brass Fitting
2.11
End date: Tuesday Dec-23-2014 20:01:48 GMT
Buy it now for only: £2.11
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1/2 Inch BSP Chrome Plated Brass Cap | British Standard Pipe Thread Fitting
2.84
End date: Wednesday Dec-10-2014 14:48:29 GMT
Buy it now for only: £2.84
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3/4 x 3/4 x 1/2 Inch Black Iron Tee | ? X ? X ? BSP
1.10
End date: Wednesday Dec-10-2014 11:56:06 GMT
Buy it now for only: £1.10
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1/2 Inch BSP Brass Male x Female Elbow (M x F) | British Standard Pipe Thread
3.94
End date: Friday Dec-19-2014 19:57:09 GMT
Buy it now for only: £3.94
Buy it now  |  Add to watch list

1 1/4 Inch BSP Plastic Back Nut | British Standard Pipe Thread Fitting
1.45
End date: Wednesday Dec-10-2014 15:00:12 GMT
Buy it now for only: £1.45
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1 Inch Brass Hex Nipple | BSP | British Standard Pipe Thread Fitting
3.91
End date: Monday Dec-08-2014 21:27:29 GMT
Buy it now for only: £3.91
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Rubber Plumbing Heating 1/2" BSP Washers. 22mm Internal Diameter (10 Pack)
2.20
End date: Monday Dec-15-2014 13:14:56 GMT
Buy it now for only: £2.20
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22mm x 3/4 Inch Female BSP Compression Elbow | Brass Fitting
3.56
End date: Saturday Dec-20-2014 21:18:47 GMT
Buy it now for only: £3.56
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3/4? Brass Blanking Cap and Washer | ? BSP | British Standard Pipe Thread
1.99
End date: Wednesday Dec-10-2014 14:41:01 GMT
Buy it now for only: £1.99
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1 1/2 Inch BSP Brass Cap | British Standard Pipe Thread Fitting
6.43
End date: Sunday Dec-07-2014 20:46:55 GMT
Buy it now for only: £6.43
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3/4" BSP 3 Bar Water Pressure Relief Safety Valve. Unusual large size.
9.26
End date: Saturday Dec-13-2014 8:17:17 GMT
Buy it now for only: £9.26
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American Fridge Freezer Quarter Inch Pipe x 3/4 Inch BSP Coupler
3.78
End date: Friday Dec-12-2014 22:25:29 GMT
Buy it now for only: £3.78
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1/2 Inch BSP Inline Brass Filter / Strainer. With Stainless Steel Element.
3.46
End date: Tuesday Dec-09-2014 21:19:05 GMT
Buy it now for only: £3.46
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1/4 Inch x 1/8 Inch Brass Hex Bush | BSP | British Standard Pipe Thread Fitting
1.00
End date: Thursday Dec-04-2014 8:03:37 GMT
Buy it now for only: £1.00
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3/8 Inch BSP Brass Cap | British Standard Pipe Thread Fitting
1.26
End date: Monday Dec-08-2014 21:27:18 GMT
Buy it now for only: £1.26
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3/4 Inch BSP Inline Brass Filter With Stainless Element
6.01
End date: Wednesday Dec-10-2014 12:24:32 GMT
Buy it now for only: £6.01
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15mm x 1/2 Inch BSP x 300mm Flexible Tap Connector Hose / Tail
2.10
End date: Sunday Dec-07-2014 13:16:07 GMT
Buy it now for only: £2.10
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Brass Hex Nipple 1/4 Inch x 1/8 Inch BSP | British Standard Pipe Thread Fitting
3.20
End date: Tuesday Dec-23-2014 17:26:36 GMT
Buy it now for only: £3.20
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3/8 Inch BSP Brass Gate Valve. Water Valve With Red Handle.
6.65
End date: Wednesday Dec-10-2014 11:49:44 GMT
Buy it now for only: £6.65
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3/4 Inch BSP Brass Threaded Male x Female Elbow / Bend (M x F)
6.71
End date: Saturday Nov-29-2014 8:16:07 GMT
Buy it now for only: £6.71
Buy it now  |  Add to watch list

Brass Hex Nipple 3/8 Inch x 1/4 Inch BSP | British Standard Pipe Thread Fitting
2.80
End date: Tuesday Dec-02-2014 10:05:50 GMT
Buy it now for only: £2.80
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1/2" BSP x 1/2" BSP x 300mm Flexible Connector
1.98
End date: Saturday Nov-29-2014 13:02:53 GMT
Buy it now for only: £1.98
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Braided Flexible Heating Oil Line Hose 1/4 Inch BSP Female x 1/4 Inch BSP Female
10.52
End date: Tuesday Dec-09-2014 9:36:49 GMT
Buy it now for only: £10.52
Buy it now  |  Add to watch list

1 Inch BSP Brass Female x Female Elbow ( F x F) | British Standard Pipe Thread
6.45
End date: Monday Dec-08-2014 20:13:39 GMT
Buy it now for only: £6.45
Buy it now  |  Add to watch list

1 Inch BSP Brass Gate Valve
6.40
End date: Monday Dec-08-2014 20:13:50 GMT
Buy it now for only: £6.40
Buy it now  |  Add to watch list

1/2 Inch BSP Safety Valve - Pressure Relief Valve
2.99
End date: Sunday Dec-14-2014 10:47:44 GMT
Buy it now for only: £2.99
Buy it now  |  Add to watch list

3 Bar Pressure Relief Safety Valve - 1/2" BSP Female x Female
4.99
End date: Sunday Dec-14-2014 11:36:07 GMT
Buy it now for only: £4.99
Buy it now  |  Add to watch list

3/4 Inch BSP Brass Gate Valve
3.88
End date: Wednesday Dec-10-2014 22:12:46 GMT
Buy it now for only: £3.88
Buy it now  |  Add to watch list

15mm x 1/2 Inch Female BSP Chrome Plated Outside Tap Wall Plate Elbow
4.40
End date: Saturday Dec-20-2014 21:18:42 GMT
Buy it now for only: £4.40
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Blanking Plugs - British Standard Pipe Thread (2 Pack)
2.50
End date: Tuesday Dec-09-2014 20:41:18 GMT
Buy it now for only: £2.50
Buy it now  |  Add to watch list

Central Heating Oil Filter - Alloy - 3/8 Inch BSP
5.57
End date: Monday Dec-08-2014 21:11:13 GMT
Buy it now for only: £5.57
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Female x Female Elbow (F x F) | British Standard Pipe Thread
4.03
End date: Sunday Dec-07-2014 11:51:30 GMT
Buy it now for only: £4.03
Buy it now  |  Add to watch list

22mm x 3/4 Inch Male BSP Compression Coupler | Brass Fitting
2.22
End date: Tuesday Dec-23-2014 20:43:44 GMT
Buy it now for only: £2.22
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Gate Valve
3.52
End date: Tuesday Dec-09-2014 20:00:04 GMT
Buy it now for only: £3.52
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Female x Female Elbow (F x F) | British Standard Pipe Thread
3.24
End date: Thursday Dec-11-2014 9:15:17 GMT
Buy it now for only: £3.24
Buy it now  |  Add to watch list

3/4 Inch BSP Brass Socket | British Standard Pipe Thread Fitting
2.39
End date: Monday Dec-08-2014 21:00:59 GMT
Buy it now for only: £2.39
Buy it now  |  Add to watch list

8mm x 3/8 Inch Male BSP Compression Coupler | Brass Fitting
1.86
End date: Tuesday Dec-09-2014 20:00:20 GMT
Buy it now for only: £1.86
Buy it now  |  Add to watch list

15mm x 1/2 Inch Female BSP Compression Coupler | Brass Fitting
2.13
End date: Thursday Dec-18-2014 8:11:35 GMT
Buy it now for only: £2.13
Buy it now  |  Add to watch list

8mm x 1/4 Inch Male BSP Compression Coupler | Brass Fitting
1.57
End date: Monday Dec-08-2014 21:11:04 GMT
Buy it now for only: £1.57
Buy it now  |  Add to watch list

28mm x 1 Inch Female BSP Compression Coupler | Brass Fitting
4.42
End date: Friday Nov-28-2014 10:37:55 GMT
Buy it now for only: £4.42
Buy it now  |  Add to watch list

Plastic 3/4" BSP x 1/2" BSP Reducing Bushes With Washers (20 Pack)
2.49
End date: Tuesday Dec-09-2014 15:04:28 GMT
Buy it now for only: £2.49
Buy it now  |  Add to watch list

3/4 Inch BSP High Pressure Float Valve / Ballcock
14.03
End date: Tuesday Dec-09-2014 16:18:55 GMT
Buy it now for only: £14.03
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3/4 Inch BSP x 100mm Long Steel Barrel Nipple
4.99
End date: Thursday Dec-11-2014 14:27:48 GMT
Buy it now for only: £4.99
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22mm x 1 Inch Female BSP Compression Coupler | Brass Fitting
4.12
End date: Tuesday Dec-23-2014 12:20:32 GMT
Buy it now for only: £4.12
Buy it now  |  Add to watch list

1 1/4 Inch BSP Brass Back Nut | British Standard Pipe Thread Fitting
3.19
End date: Wednesday Dec-10-2014 11:12:02 GMT
Buy it now for only: £3.19
Buy it now  |  Add to watch list

1/2? Brass Flanged Back-Nuts | ? BSP | British Standard Pipe Thread | Pack of 2
2.10
End date: Monday Dec-08-2014 21:00:49 GMT
Buy it now for only: £2.10
Buy it now  |  Add to watch list

1/4 Inch BSP Brass Cap | British Standard Pipe Thread Fitting
1.20
End date: Wednesday Dec-10-2014 11:59:42 GMT
Buy it now for only: £1.20
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Cap | British Standard Pipe Thread Fitting
1.27
End date: Wednesday Dec-10-2014 12:05:05 GMT
Buy it now for only: £1.27
Buy it now  |  Add to watch list

3/4 Inch x 1/4 Inch Brass Hex Bush | BSP - British Standard Pipe Thread Fitting
2.19
End date: Thursday Dec-18-2014 8:11:32 GMT
Buy it now for only: £2.19
Buy it now  |  Add to watch list

1/4 Inch BSP Brass Socket | British Standard Pipe Thread Fitting
1.51
End date: Tuesday Dec-09-2014 21:18:38 GMT
Buy it now for only: £1.51
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1/8 Inch Brass Socket / Coupler | BSP - British Standard Pipe Thread
1.00
End date: Tuesday Dec-09-2014 20:01:07 GMT
Buy it now for only: £1.00
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3 Bar Pressure Relief Safety Valve - 1/2" BSP Male x Female (M x F)
5.49
End date: Sunday Dec-14-2014 11:38:56 GMT
Buy it now for only: £5.49
Buy it now  |  Add to watch list

8mm x 1/4 Inch Female BSP Compression Elbow | Brass Fitting
1.96
End date: Tuesday Dec-23-2014 21:11:52 GMT
Buy it now for only: £1.96
Buy it now  |  Add to watch list

3/8 Inch BSP X 3/8 Inch BSP Oil Line Nipple - Conical Faces
2.42
End date: Monday Dec-08-2014 20:13:28 GMT
Buy it now for only: £2.42
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Equal Tee Fitting | British Standard Pipe Thread Fitting
4.42
End date: Tuesday Dec-09-2014 21:49:50 GMT
Buy it now for only: £4.42
Buy it now  |  Add to watch list

1/8 Inch Brass Hex Nipple | BSP | British Standard Pipe Thread Fitting
1.35
End date: Saturday Dec-13-2014 16:58:31 GMT
Buy it now for only: £1.35
Buy it now  |  Add to watch list

3/4 Inch X 1/2 Inch BSP Malleable Black Iron Reducing Bush
1.62
End date: Tuesday Dec-09-2014 9:51:33 GMT
Buy it now for only: £1.62
Buy it now  |  Add to watch list

42mm x 1 1/2 Inch Male BSP Compression Coupler | Brass Fitting
11.30
End date: Monday Nov-24-2014 8:44:52 GMT
Buy it now for only: £11.30
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Equal Tee Fitting | British Standard Pipe Thread Fitting
4.50
End date: Tuesday Dec-09-2014 21:27:02 GMT
Buy it now for only: £4.50
Buy it now  |  Add to watch list

10mm x 1/2 Inch Female BSP Compression Coupler | Brass Fitting
2.26
End date: Saturday Dec-20-2014 21:16:46 GMT
Buy it now for only: £2.26
Buy it now  |  Add to watch list

3/4 Inch Brass Flanged Plug | BSP - British Standard Pipe Thread Fitting
2.31
End date: Sunday Dec-07-2014 20:30:52 GMT
Buy it now for only: £2.31
Buy it now  |  Add to watch list

1 1/2 Inch x 1 Inch Brass Hex Bush | BSP - British Standard Pipe Thread
3.40
End date: Saturday Dec-06-2014 16:08:15 GMT
Buy it now for only: £3.40
Buy it now  |  Add to watch list

1 Inch BSP Brass Back Nut | British Standard Pipe Thread Fitting
2.10
End date: Tuesday Dec-09-2014 9:37:22 GMT
Buy it now for only: £2.10
Buy it now  |  Add to watch list

22mm x 1 Inch Male BSP Compression Elbow | Brass Fitting
4.35
End date: Tuesday Dec-09-2014 20:21:01 GMT
Buy it now for only: £4.35
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Socket | British Standard Pipe Thread Fitting
1.64
End date: Wednesday Dec-10-2014 12:24:21 GMT
Buy it now for only: £1.64
Buy it now  |  Add to watch list

3/4 Inch BSP Brass Back Nut | British Standard Pipe Thread Fitting
1.25
End date: Friday Dec-12-2014 9:24:03 GMT
Buy it now for only: £1.25
Buy it now  |  Add to watch list

7 Bar 1/2 Inch BSP Safety Valve - Pressure Relief Valve
9.26
End date: Tuesday Dec-23-2014 21:13:32 GMT
Buy it now for only: £9.26
Buy it now  |  Add to watch list

1/2 Inch BSP Malleable Black Iron Elbow Female x Female (F x F)
1.36
End date: Tuesday Dec-09-2014 20:00:39 GMT
Buy it now for only: £1.36
Buy it now  |  Add to watch list

1/4 Inch x 1/4 Inch BSP Oil Line Nipple - Conical Faces
2.42
End date: Monday Dec-08-2014 21:39:07 GMT
Buy it now for only: £2.42
Buy it now  |  Add to watch list

1 1/2 Inch BSP Brass Back Nut | British Standard Pipe Thread Fitting
3.88
End date: Wednesday Dec-10-2014 11:11:51 GMT
Buy it now for only: £3.88
Buy it now  |  Add to watch list

Gauge Cock 3/8 Inch BSP Ideal for Models etc. Retro Design
9.99
End date: Friday Nov-28-2014 19:50:04 GMT
Buy it now for only: £9.99
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