This drain plug and gasket is designed to use with Hayward TriStar pump series SP3200EE, SP3200X and TriStar waterfall pump series SP3600. Also fits Hayward NorthStar pump series SP4000, SP4000X and Max-Flo II pump series SP2700X. Also compatible Hayward Booster pump model 6060 and Universal H-series Low NOx heaters. And also compatible HeatPro heat pump models HP6003T, HP11003T, HP21003T, HP21203T, HP2100TCO3T. Also fits Hayward Perflex extended cycle D.E. filter, Pro and VL series sand filter models EC50C92SFT, S210T93SFT. Includes o-ring. Weighs 2-pound.