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Imperial PVC

Imperial PVC Pipe And Fittings 

You must read this information twice before you buy anything from this section or you will order the wrong size Imperial pipe.  

 

Imperial pipe is measured and classified as an inside diameter.  This is unlike metric PVC pipe that is measured as an outside diameter. AS an example a 50mm metric PVC pipe will measure 50 mm on the outside of the pipe.  If you convert this to inches then one would assume that this would convert to a 2" imperial pipe.  This is incorrect as a 2" imperial PVC pipe will measure 2 inches on the inside and will have an outside diameter of 61 mm.  

Normally most people on a new installation will instal metric PVC pipe however many existing installations like swimming pools, Hot tubs, old factories etc will have an imperial PVC pipe installed and these may from time to time need repairing.  

Before you start ordering your fittings please measure the outside diameter of your PVC pipe in mm's.  This must be accurate as a 2mm error could lead you to buy imperial fittings rather then metric.  AS an example a 2" imperial PVC pipe will measure 61mm outside diameter while the metric equivalent will measure 63mm.

Please compare the outside diameter to the table below so that you can choose the correct size fitting for your repair.  If installing a new system then please refer to the metric equivalent as this will be cheaper and far more accessible 

 

Outside Diameter

in mm's

True Size  Action To Take 
20 mm 20mm Metric

Click here for 20mm

21 mm 1/2" Imperial  Choose fittings from list below
25 mm 25 mm metric  Click here for 25mm
26.5 mm 3/4" imperial  Choose fittings from list below
32 mm 32 mm Metric Click here for 32 mm metric
33 mm 1" Imperial  Choose fittings from list below
40 mm 40 mm metric  Click here for 40 mm metric 
42 mm 11/4" Imperial  Choose from fittings below 
47.5 mm 11/2" Imperial  Choose from fittings below 
50 mm 50 mm Metric  Click here for 50 mm metric 
61 mm 2" Imperial  Choose from fittings below 
63 mm 63 mm Metric  Click here for 63 mm Metric