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

1.25 Inch

11

2.309

41.910

1.650

1.5 Inch

11

2.309

47.803

1.882

2 Inch

11

2.309

59.614

2.347

2.5 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


1.5 Inch BSP Brass Screwed Back Nut (British Standard Pipe Thread)
3.88
End date: Sunday May-18-2014 22:04:41 BST
Buy it now for only: £3.88
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Braided Flexible Heating Oil Line 1/4 Inch BSP Female x 1/4 Inch BSP Female
10.52
End date: Sunday May-18-2014 22:04:27 BST
Buy it now for only: £10.52
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3/8 Inch Brass Male x Female Elbow | 3/8? BSP M x F
2.80
End date: Sunday May-04-2014 15:57:15 BST
Buy it now for only: £2.80
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1/2 Inch BSP Radiator Tails. Radiator Valve Connecting Pieces (Pack of 2)
2.99
End date: Monday Apr-28-2014 9:40:58 BST
Buy it now for only: £2.99
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Automatic Air Vent (Bottle Type) 1/2 Inch BSP
4.67
End date: Saturday May-03-2014 14:14:25 BST
Buy it now for only: £4.67
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1.25 Inch BSP Brass Back Nut (British Standard Pipe Thread)
3.19
End date: Tuesday Apr-22-2014 20:36:34 BST
Buy it now for only: £3.19
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Blanking Plugs (2 Pack)
2.50
End date: Sunday Apr-27-2014 19:03:40 BST
Buy it now for only: £2.50
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1/2 Inch BSP Inline Brass Filter / Strainer. With Stainless Steel Element.
3.46
End date: Wednesday Apr-23-2014 10:36:38 BST
Buy it now for only: £3.46
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6 Bar 1/2 Inch BSP Safety Valve / Water Pressure Relief Valve
6.03
End date: Thursday May-01-2014 11:00:18 BST
Buy it now for only: £6.03
Buy it now  |  Add to watch list

1/4 Inch Brass Male x Female Elbow | ? BSP M x F
2.50
End date: Saturday May-03-2014 12:25:29 BST
Buy it now for only: £2.50
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1/4 Inch Brass Female x Female Elbow | ? BSP F x F
2.99
End date: Saturday May-03-2014 12:18:28 BST
Buy it now for only: £2.99
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Washing Machine Waste Blank | 1? BSP | 1 Inch BSP Plastic Cap And Washer
2.99
End date: Saturday May-03-2014 12:13:36 BST
Buy it now for only: £2.99
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1/2 Inch BSP Drain Cock Valve With Leakproof Gland (Type A)
2.72
End date: Friday Apr-25-2014 9:55:41 BST
Buy it now for only: £2.72
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1.25 Inch BSP Brass Cap (British Standard Pipe Thread)
3.96
End date: Friday Apr-25-2014 9:56:28 BST
Buy it now for only: £3.96
Buy it now  |  Add to watch list

3/4 Inch BSP Brass Blanking Plug (British Standard Pipe Thread).
2.31
End date: Wednesday May-14-2014 11:10:15 BST
Buy it now for only: £2.31
Buy it now  |  Add to watch list

1/4 Inch Brass Flanged Plugs | ? BSP | British Standard Pipe Thread | 2 Pack
2.52
End date: Sunday May-18-2014 22:04:32 BST
Buy it now for only: £2.52
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2 Inch BSP Brass Plug (British Standard Pipe Thread)
8.19
End date: Sunday Apr-27-2014 19:41:13 BST
Buy it now for only: £8.19
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Threaded Female x Female Elbow / Bend (F x F)
2.46
End date: Friday May-16-2014 18:34:49 BST
Buy it now for only: £2.46
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1/2? Brass Flanged Back-Nuts | ? BSP | British Standard Pipe Thread | Pack of 2
2.10
End date: Saturday Apr-26-2014 11:48:00 BST
Buy it now for only: £2.10
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15mm x 3/4 Inch Male BSP Compression Coupler / Connector
2.95
End date: Sunday May-11-2014 11:59:35 BST
Buy it now for only: £2.95
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10mm x 1/4 Inch Male BSP Compression Coupler / Adaptor
1.80
End date: Saturday May-03-2014 12:27:18 BST
Buy it now for only: £1.80
Buy it now  |  Add to watch list

10mm x 3/8 Inch BSP Male Compression Coupler / Connection
1.76
End date: Sunday May-11-2014 11:55:26 BST
Buy it now for only: £1.76
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1? Brass Blanking Cap | 1 Inch BSP | British Standard Pipe Thread
2.94
End date: Sunday May-18-2014 22:04:23 BST
Buy it now for only: £2.94
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Rubber Plumbing Heating 1/2" BSP Washers. 22mm Internal Diameter (10 Pack )
2.20
End date: Monday May-19-2014 14:14:56 BST
Buy it now for only: £2.20
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3/4 Inch BSP High Pressure Float Valve / Ballcock
14.03
End date: Saturday Apr-26-2014 14:24:08 BST
Buy it now for only: £14.03
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1/8 Inch BSP Brass Threaded Male x Female Elbow / Bend (M x F)
3.54
End date: Monday May-19-2014 10:45:46 BST
Buy it now for only: £3.54
Buy it now  |  Add to watch list

3/4 Inch BSP Brass Gate Valve
3.88
End date: Sunday May-18-2014 12:41:42 BST
Buy it now for only: £3.88
Buy it now  |  Add to watch list

1/2 Inch BSP Male x 15mm Compression Straight Connector / Coupler
2.99
End date: Sunday Apr-27-2014 19:45:49 BST
Buy it now for only: £2.99
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3/4 Inch BSP Brass Back Nuts (British Standard Pipe Thread) Pack of 2
3.28
End date: Wednesday May-21-2014 1:07:42 BST
Buy it now for only: £3.28
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3/4? x 3/4? x 1/2? Black Iron Tee | ? X ? X ? BSP
1.10
End date: Saturday Apr-26-2014 17:09:01 BST
Buy it now for only: £1.10
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1/4 Inch BSP x 6mm Compression Male Straight Connector / Coupler
1.97
End date: Wednesday Apr-23-2014 10:40:27 BST
Buy it now for only: £1.97
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1/4 Inch BSP Brass Nipple (British Standard Pipe Thread)
1.34
End date: Sunday May-18-2014 22:05:23 BST
Buy it now for only: £1.34
Buy it now  |  Add to watch list

1 Inch BSP x 1/2 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
2.89
End date: Saturday May-03-2014 15:36:39 BST
Buy it now for only: £2.89
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Blanking Cap (British Standard Pipe Thread)
1.23
End date: Sunday Apr-27-2014 19:07:30 BST
Buy it now for only: £1.23
Buy it now  |  Add to watch list

1/4 Inch BSP Brass Socket / Coupler (British Standard Pipe Thread)
1.51
End date: Wednesday Apr-23-2014 10:39:51 BST
Buy it now for only: £1.51
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1/2 Inch BSP Chrome Plated Brass Cap (British Standard Pipe Thread)
2.84
End date: Friday May-16-2014 18:35:18 BST
Buy it now for only: £2.84
Buy it now  |  Add to watch list

1 Inch BSP Brass Threaded Male x Female Elbow / Bend (M x F)
7.36
End date: Wednesday Apr-23-2014 13:47:05 BST
Buy it now for only: £7.36
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1/4 Inch BSP Brass Equal Tee Fitting (British Standard Pipe Thread)
3.91
End date: Saturday May-10-2014 17:05:40 BST
Buy it now for only: £3.91
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3/8 Inch BSP Female x 15mm Compression Flexible Tap Connector.
2.80
End date: Sunday Apr-27-2014 22:18:15 BST
Buy it now for only: £2.80
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Gate Valve
3.52
End date: Thursday May-01-2014 10:59:51 BST
Buy it now for only: £3.52
Buy it now  |  Add to watch list

15mm x 1/2 Inch Female BSP Compression Coupler / Connector
2.13
End date: Thursday Apr-24-2014 22:20:53 BST
Buy it now for only: £2.13
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1/4 Inch BSP Brass Cap (British Standard Pipe Thread)
1.20
End date: Sunday May-11-2014 11:53:50 BST
Buy it now for only: £1.20
Buy it now  |  Add to watch list

1.5 Inch x 1 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
3.40
End date: Saturday May-10-2014 17:08:15 BST
Buy it now for only: £3.40
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Threaded Male x Female Elbow / Bend (M x F)
3.94
End date: Wednesday Apr-23-2014 10:45:06 BST
Buy it now for only: £3.94
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Cap (British Standard Pipe Thread)
1.27
End date: Sunday May-11-2014 11:54:33 BST
Buy it now for only: £1.27
Buy it now  |  Add to watch list

2 Inch BSP Brass Back Nut (British Standard Pipe Thread)
9.04
End date: Monday May-12-2014 11:35:17 BST
Buy it now for only: £9.04
Buy it now  |  Add to watch list

8mm x 1/4 Inch Female BSP Compression Coupler / Connector
2.38
End date: Sunday Apr-27-2014 22:11:56 BST
Buy it now for only: £2.38
Buy it now  |  Add to watch list

1/2 Inch BSP x 3/8 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
1.00
End date: Saturday May-10-2014 15:48:57 BST
Buy it now for only: £1.00
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Plugs British Standard Pipe Thread (2 Pack)
2.54
End date: Friday Apr-25-2014 9:55:36 BST
Buy it now for only: £2.54
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10mm x 1/4 Inch Female BSP Compression Female Coupler / Connector
1.73
End date: Sunday Apr-27-2014 21:01:35 BST
Buy it now for only: £1.73
Buy it now  |  Add to watch list

22mm x 3/4 Inch Female BSP Compression Coupler / Connector
2.84
End date: Sunday Apr-27-2014 21:45:17 BST
Buy it now for only: £2.84
Buy it now  |  Add to watch list

22mm x 3/4 Inch Male BSP Compression Coupler / Connector
2.22
End date: Sunday Apr-27-2014 21:43:44 BST
Buy it now for only: £2.22
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Threaded Female x Female Elbow / Bend ( F x F)
4.03
End date: Saturday May-10-2014 10:13:27 BST
Buy it now for only: £4.03
Buy it now  |  Add to watch list

28mm x 1 Inch Female BSP Compression Coupler / Connector
4.42
End date: Thursday Apr-24-2014 22:16:39 BST
Buy it now for only: £4.42
Buy it now  |  Add to watch list

22mm x 1 Inch Female BSP Compression Coupler / Connector
4.12
End date: Sunday Apr-27-2014 21:45:27 BST
Buy it now for only: £4.12
Buy it now  |  Add to watch list

1.25 Inch BSP x 1 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
2.14
End date: Tuesday Apr-22-2014 16:37:13 BST
Buy it now for only: £2.14
Buy it now  |  Add to watch list

1/8 Inch BSP Brass Equal Tee Fitting (British Standard Pipe Thread)
4.50
End date: Wednesday May-07-2014 19:33:42 BST
Buy it now for only: £4.50
Buy it now  |  Add to watch list

10mm x 3/8 Inch BSP Compression Female Adaptor / Coupler. Quality brass fitting
2.93
End date: Tuesday May-20-2014 13:46:15 BST
Buy it now for only: £2.93
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Equal Tee Fitting (British Standard Pipe Thread)
5.23
End date: Monday May-12-2014 13:44:26 BST
Buy it now for only: £5.23
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3/4 Inch x 150mm BSP Barrel Nipple Mild Steel
5.35
End date: Friday May-16-2014 17:16:29 BST
Buy it now for only: £5.35
Buy it now  |  Add to watch list

15mm Compression Tee With 1/2 Inch Female BSP Branch. Useful For Drain Or Vent
2.76
End date: Monday Apr-28-2014 11:03:09 BST
Buy it now for only: £2.76
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Socket / Coupler (British Standard Pipe Thread)
1.64
End date: Sunday May-04-2014 11:38:32 BST
Buy it now for only: £1.64
Buy it now  |  Add to watch list

1 Inch BSP Brass Gate Valve
6.40
End date: Sunday May-18-2014 12:03:35 BST
Buy it now for only: £6.40
Buy it now  |  Add to watch list

15mm x 3/4 Inch Female BSP Compression Elbow / Bend
6.42
End date: Thursday Apr-24-2014 22:21:02 BST
Buy it now for only: £6.42
Buy it now  |  Add to watch list

1/2 Inch BSP Low Pressure BS1212 Brass Float Valve / Ballcock
10.74
End date: Sunday Apr-27-2014 18:33:15 BST
Buy it now for only: £10.74
Buy it now  |  Add to watch list

1 Inch BSP Brass Plug (British Standard Pipe Thread)
3.04
End date: Sunday Apr-27-2014 19:00:17 BST
Buy it now for only: £3.04
Buy it now  |  Add to watch list

2? Brass Blanking Cap | 2 Inch BSP | British Standard Pipe Thread
7.72
End date: Thursday May-01-2014 10:51:15 BST
Buy it now for only: £7.72
Buy it now  |  Add to watch list

Flexible Braided Oil Line 3/8 Inch Female X 1/4" Male BSP. Suits Reillo Burners.
10.52
End date: Monday Apr-28-2014 13:21:19 BST
Buy it now for only: £10.52
Buy it now  |  Add to watch list

22mm x 1 Inch Male BSP Compression Elbow / Bend
4.35
End date: Sunday May-18-2014 22:04:52 BST
Buy it now for only: £4.35
Buy it now  |  Add to watch list

1.25 Inch BSP Brass Plug (Bristish Standard Pipe Thread)
3.36
End date: Sunday May-18-2014 22:04:47 BST
Buy it now for only: £3.36
Buy it now  |  Add to watch list

3/4 Inch X 1/2 Inch BSP Malleable Black Iron Reducing Bush
1.62
End date: Wednesday Apr-30-2014 15:57:47 BST
Buy it now for only: £1.62
Buy it now  |  Add to watch list

3/4? Brass Blanking Cap and Washer | ? BSP | British Standard Pipe Thread
1.99
End date: Sunday Apr-27-2014 18:47:23 BST
Buy it now for only: £1.99
Buy it now  |  Add to watch list

15mm x 12mm Compression Reducing Coupler / Connector. With 3/8 Inch BSP Feature
3.16
End date: Monday May-19-2014 11:21:06 BST
Buy it now for only: £3.16
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1.5 Inch BSP Long Tail Chrome Plated Shower Outlet Waste
15.89
End date: Monday May-12-2014 13:45:43 BST
Buy it now for only: £15.89
Buy it now  |  Add to watch list

11/4 Inch x 1/2 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
2.14
End date: Saturday May-10-2014 20:54:02 BST
Buy it now for only: £2.14
Buy it now  |  Add to watch list

Chrome Plated Reducing Bush 3/4 Inch BSP x 1/2 Inch BSP
3.69
End date: Wednesday May-14-2014 18:03:44 BST
Buy it now for only: £3.69
Buy it now  |  Add to watch list

3/4 Inch BSP Malleable Black Iron Elbow / Bend. Female x Female FXF
1.88
End date: Monday May-12-2014 22:21:24 BST
Buy it now for only: £1.88
Buy it now  |  Add to watch list

3/4 Inch BSP Brass Threaded Male x Female Elbow / Bend (M x F)
6.71
End date: Sunday Apr-27-2014 20:08:55 BST
Buy it now for only: £6.71
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Gate Valve. Water Valve With Red Handle.
6.65
End date: Wednesday Apr-23-2014 10:28:09 BST
Buy it now for only: £6.65
Buy it now  |  Add to watch list

1/4 Inch BSP x 1/8 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
1.00
End date: Tuesday Apr-22-2014 9:13:29 BST
Buy it now for only: £1.00
Buy it now  |  Add to watch list

10mm x 1/2 Inch Female BSP Compression Elbow / Bend
2.49
End date: Sunday Apr-27-2014 21:01:54 BST
Buy it now for only: £2.49
Buy it now  |  Add to watch list

3 Bar Boiler Safety Pressure Relief Valve. 1/2 Inch BSP Female x Female
5.55
End date: Friday Apr-25-2014 9:56:04 BST
Buy it now for only: £5.55
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Nipple (British Standard Pipe Thread)
1.91
End date: Sunday May-04-2014 3:33:33 BST
Buy it now for only: £1.91
Buy it now  |  Add to watch list

3/8 Inch BSP x 1/4 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
1.00
End date: Tuesday Apr-22-2014 16:41:02 BST
Buy it now for only: £1.00
Buy it now  |  Add to watch list

15mm x 3/4 Inch Female BSP Compression Coupler / Connector
3.17
End date: Friday May-16-2014 21:15:03 BST
Buy it now for only: £3.17
Buy it now  |  Add to watch list

1.5 Inch BSP x 1.25 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
2.81
End date: Tuesday Apr-22-2014 16:38:38 BST
Buy it now for only: £2.81
Buy it now  |  Add to watch list

1/2 Inch BSP Malleable Black Iron Equal Tee (British Standard Pipe Thread)
1.88
End date: Wednesday Apr-30-2014 14:36:54 BST
Buy it now for only: £1.88
Buy it now  |  Add to watch list

Brass Reducing Nipple 1/4 Inch BSP x 1/8 Inch BSP (British Standard Pipe Thread)
3.20
End date: Sunday Apr-27-2014 18:26:36 BST
Buy it now for only: £3.20
Buy it now  |  Add to watch list

15mm x 1/2 Inch BSP Male Compression Elbow (British Standard Pipe Thread)
1.58
End date: Sunday Apr-27-2014 21:53:45 BST
Buy it now for only: £1.58
Buy it now  |  Add to watch list

1.25 Inch BSP Brass Socket / Coupler (British Standard Pipe Thread)
4.44
End date: Sunday May-04-2014 13:38:04 BST
Buy it now for only: £4.44
Buy it now  |  Add to watch list

28mm x 1 Inch Male BSP Compression Elbow (British Standard Pipe Thread)
4.78
End date: Monday May-19-2014 11:40:45 BST
Buy it now for only: £4.78
Buy it now  |  Add to watch list

1/2 Inch BSP Brass Socket / Coupler (British Standard Pipe Thread)
2.01
End date: Sunday May-04-2014 15:20:26 BST
Buy it now for only: £2.01
Buy it now  |  Add to watch list

15mm Copper x 1/2 Inch Female BSP Chrome Plated Compression Connector / Coupler
2.60
End date: Sunday Apr-27-2014 18:09:18 BST
Buy it now for only: £2.60
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1/2 Inch Brass Swing Check | ? BSP | Non-Return Valve
5.42
End date: Sunday May-04-2014 15:50:51 BST
Buy it now for only: £5.42
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3/8 Inch BSP Alloy Central Heating Oil Filter
5.57
End date: Tuesday May-06-2014 11:07:08 BST
Buy it now for only: £5.57
Buy it now  |  Add to watch list

3/8 Inch BSP Brass Nipple (British Standard Pipe Thread)
1.64
End date: Wednesday May-07-2014 11:18:32 BST
Buy it now for only: £1.64
Buy it now  |  Add to watch list

3/8 Inch X 1/4 Inch BSP Heating Oil Line Nipple - Conical Faces
2.42
End date: Monday May-19-2014 17:21:05 BST
Buy it now for only: £2.42
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10mm x 3/8 Inch Female BSP Compression Elbow / Bend
2.11
End date: Sunday Apr-27-2014 21:01:48 BST
Buy it now for only: £2.11
Buy it now  |  Add to watch list

2 Inch BSP x 1 Inch BSP Brass Reducing Bush (British Standard Pipe Thread)
8.38
End date: Tuesday Apr-22-2014 16:40:53 BST
Buy it now for only: £8.38
Buy it now  |  Add to watch list

8mm x 1/4 Inch Male BSP Compression Elbow / Bend
1.38
End date: Sunday Apr-27-2014 22:11:47 BST
Buy it now for only: £1.38
Buy it now  |  Add to watch list


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