Hayward quick connect union pack includes 2 each of socket connector, union nut, O-ring. 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. Made of ABS plastic material. It has 1-1/2-inch socket end.