Hi everyone, I have an Intex 16' x4' round pool. I upgraded to a sand filter this year with a 3/4 hp pump. I think the sand filter is 18. The pool has the black plastic tubing coming through the wall for the filter in and return. They are 1.25". Evidently, they do not make those little white plastic adaptors anymore to attach a 1.5" hose on the outside. I bought 2 of those intex hose adaptors that screw onto the black outlets with the strainers through the wall. No matter how tight I tighten the adaptors, they keep sliding off. I have rigged up some PVC to barbed pieces to go from the adaptor to shut off valves and then to the filter. If I wrap some electrial tape around the black plastic coming out of the pool wall, will that help? OR should I break down and buy the Intex plunger assemblies (I assume they are for shutting off the water). Maybe the PVC to barb gizmo I made is too heavy and is pulling it off the black plastic through the pool thing. When I had the little white ring adaptors, everything was working fine, but I have lost one. Thanks in advance for any help and suggestions. I am at the point of giving up on this........Bill On the plus side, this year, we got the ground level and did not have to fill the pool 3 times!