This Housing O-Ring is designed to use with Hayward ABG, PowerFlo LX and PowerFlo II above ground pool pump models SP1580, SP1580X15, SW1585X20, SW1585X25, SP1540C, SP1750, 1775, 1780 and also compatible with Hayward EasyClear, Pro and VL series above ground filter models C5501575XES, S166T1580S. Weighs 10.7-Pound.