Stevenson Plumbing and Electrical Supplies

We don't stock the old Alkathene underground pipe or fittings any more. For reference, we've shown below information about it's sizing.

Pay careful attention to the sizing of Alkathene pipe. The name of the pipe doesn't always match it's actual dimensions, best bet is to have a good look at the pipe, as the size and class is usually marked on it. It also usually is marked "BS 1972"

Half inch alkathene pipe BS1972

The pipe mainly came in two different types, class C and class D, the difference being the thickness of the wall (the more popular class C was thinner).


Approximate Alkathene Pipe Sizes
Pipe Class C ID Class C OD Class D ID Class D OD
3/8 inch 12mm 17.5mm   17.5mm
1/2 inch 15.5mm 21.5mm 14.1mm 21.5mm
3/4 inch 19.5mm 26.9mm 17.5mm 26.9mm
1 inch 24.5mm 33.7mm 21.9mm 33.7mm