I am using a McAlpine Coupling. These fittings suit 32mm id with a 36mm od.My extension tube only has an outside diameter of 32.5 mm. the McAlpine rubber washer does't close around the tube enough
I've purchased a minimalist bottle trap. The 32mm extension tube has a very small OD. I'm having problems sealing it to the compression coupling in the wall. Any suggestions
