sand the outside of the flex until it slips in. you may want to get plumbers putty,
a tube break off chunks, knead and then put around the pipe to seal it ... it hardens
rock hard and prevents leaks. I use this stuff on my outdoor heated spa. Ingrid

On Sun, 24 Feb 2008 09:31:19 -0800 (PST), wrote:

I bought some flexible PVC pipe to connect to my pump and filter.
However, I am having problem to connect it with the normal PVC
coupling, due to the surface of the flexible PVC pipe is not as smooth
as a PVC pipe. I have a hard time to push the pipe inside the
coupling. Does anyone have similar issue and how to get around the
problem? I guess I can use a flexible coupling instead.

- tsze