Hayward SPX4000Z1 Diffuser O-ring Replacement Kit for Select Hayward Northstar, Ecostar and Tristar Pump Diffuser o-ring replacement Fits hayward northstar pump series sp4000, sp4000x, sp4015x202 Also fits hayward tristar pump series sp3200ee, sp3200x, sp36075ee, sp3250ee, sp3600 Also compatible with Hayward EcoStar pump series models SP3400VSPVR, SP3400VSP Weighs 2-pound