Hayward anchor socket is made of heavy duty ABS plastic material. It is designed to used for Hayward SP1392 valves and unions. Socket opening used to secure ladders and railing in the concrete. It will not rot or corrode. Features: Fits Hayward SP1392 valves and unions Features grounding lug outside and cap for top Anchor socket is made of heavy duty ABS plastic material Socket opening used to secure ladders and railing in the concrete