Can someone share what part they used to connect 4" PVC to 4" flex hose? Right now I have a 6" to 4" SDR reducer with bells on both ends. Would like to have a connector that I can screw on a 4" flex hose. Can either fit into the bell of the 4" or I can put a short piece of 4" pvc into the bell and then insert the adapter. I purchased one on Amazon and it doesn't fit. Instead of trial and error I figured I'd ask the group. Thanks for the help!