Pentair TR100C Inlet Upper Piping Assembly (156344) zurnwilkins 1-1/4 inch hole size with

1-1/4 inch hole size with 1-1/2 inch face diameter

and this Maytronics Dolphin version uses the 99954226-R1 reference

Above-ground pool plumbing often relies on correctly sized connection fittings to keep equipment transitions neat and leak resistant

That visual detail matters because these barrels are not hidden parts

and this Jacuzzi 2 inch Dial Valve Spring is designed for compatible applications where the original spring has weakened

Pentair TR100C Inlet Upper Piping Assembly (156344) zurnwilkins 1-1/4 inch hole size withThis genuine Pentair Pool Products inlet upper piping assembly, part 156344, is used inside compatible TR100C sand filter systems to route incoming water through the correct internal path. A properly fitted piping assembly is important for balanced distribution and dependable filter operation. Use this replacement when internal piping is cracked, damaged, or removed during a major filter rebuild. Match the TR100C model and connection layout before