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Union Plain x BSP

Union Plain x BSP

Regular price £5.00 GBP
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Union Plain x BSP


Plain x threaded unions are designed to join solvent weld imperial pipe to male threaded BSP pipe or fittings.  The threaded union enables the assembly to be readily dismantled for the purposes of maintenance, inspection and control. No special tools are required.


Imperial solvent weld PVC fittings are generally manufactured in accordance with EN1452-3. 

Threaded PVC fittings are generally manufactured in accordance with BS21, DIN2999, ISO7.

All fittings have WRAS approval and are suitable for use with potable drinking water applications.

The plain or threaded size can change from fitting to fitting. 

Pressure Rating

PVC solvent weld fittings (sizes 1/2" to 8") have a pressure rating of 15 bar (215 psi) at 20oC.

PVC threaded fittings (1/2" to 4") have a pressure rating of 12 bar (170 psi) at 20oC

As temperature increases the pressure rating is reduced.  PVC systems should not be used where temperatures exceed 60oC.

Sizing - Solvent Weld Pipe & Fittings

Imperial (inch) PVC pipe and fittings sizing is not straightforward. They are sized by their nominal bore or approximate inside diameter.

The following table details pipe outside diameters (o.d.) for each imperial size.  The inside diameter (i.d.) of the socket end of the corresponding fitting will be the same as the outside diameter of the pipe.  

Pipe Size 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
Outside Dia mm 21.4 26.7 33.6 42.2 48.3 60.3 75.2 88.9 114.3


Sizing - BSP Threads

The following table details approximate thread diameters for male BSP threads.

Nom Pipe Size 1/2" 3/4" 1" 1 1/4" 1 1/2" 2" 2 1/2" 3" 4"
Thread Dia mm 21.0 26.4 33.2 41.9 47.8 59.6 75.2 87.9 113.0
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