On Fri, 4 Mar 2011 17:01:10 +0000, wrote:

Sizes as BS3505. http://www.pipestock.com/PVC-Pipe-Dimensions.php

Looks like just normal Imperial Size Pipe.

So what fits it? It's neither 1/2" nor 3/4"

IIRC imperial pipe measures the ID, metric the OD.

17OD - (2 wall x 2) = 13 pretty close to 1/2"...

1/2" compression would take up the slack but finding an insert might
be fun get the tightest fitting one you can.

--
Cheers
Dave.