Hayward SP1500UNPAK2C 1-1/2-Inch Socket by 2-Inch SLIP Flush Union Connectors Pak Replacement for select Hayward Pumps/Filters and Chlorine Feeders Flush union connectors Fits Hayward Perflex extended-cycle DE, Pro-series top-mount sand and XStream Filtration series above-ground Full-Flo pool and spa filters Also fits Hayward Power-Flo Matrix above-ground pumps and CL100/CL200 chlorine feeders Includes 2 pieces per set It has 1-1/2-inch socket by 2-inch slip end