These are replacement parts, Buyer must install correctly, improper installation will result in leakage around cap. Seal Assembly with Cup fits Power-Flo Matrix/LX Pool Pump. Fits Hayward power-flo matrix sp1590 and power-flo lx sp1580 pump series models sp1591, sp1592, sp1593, sp1575lx, sp1580, sp1580x15, sp1520un, ep1500lx, sp1680. FITS Hayward power-flo sp1500 series pump and strainer models sp1500, sp1510, sp1511, sp1550, sp1575, ep1500, sp1516. These are replacement parts, Buyer must install correctly, improper installation will result in leakage around cap. Seal Assembly with Cup fits Power-Flo Matrix/LX Pool Pump. Fits Hayward power-flo matrix sp1590 and power-flo lx sp1580 pump series models sp1591, sp1592, sp1593, sp1575lx, sp1580, sp1580x15, sp1520un, ep1500lx, sp1680. Replacement Hayward power-flo sp1500 series pump and strainer models sp1500, sp1510, sp1511, sp1550, sp1575, ep1500, sp1516.