I've had a Kreepy Krauly for a long time, and the vacuum regulator, where it's constantly connected and disconnected from the cleaner hose, got brittle and developed a split right at the connection snout. The plastic is real thin there and realized it wouldn't be long before a section broke out. Headed to Home Depot and it turned out a white plastic 1-1/4" P-trap tail piece fit perfectly as an inside liner for a repair. Cut a short section and glued it in with PVC cement. Has lasted over a year and a half and it's rock solid. Here's a photo.
PS I think some of the P-trap parts are made of Polypropylene (PP) and some are made of PVC. If you do a repair like this, use PVC because PP isn't as bondable.