Cool pool water is refreshing but chilly pool water is no fun. Keep your pool at the temperature you enjoy and extend your swimming season with a pool heater. Make sure that heater is running the best it can with this Hayward Gas Valve Replacement Part.This gas valve replacement fits Hayward Universal H-Series pool heaters. This pool heater replacement part (part number: FDXLGSV0001) is designed for natural gas pool heaters. The gas valve is compatible with Hayward pool heater models H150FDN, H200FDN, H250FDN, H300FDN, H350FDN, and H400FDN.Control the flow of natural gas to your pool heater with this valve. It replaces a broken, missing, or damaged pool heater gas valve so your pool heater continues to run safely and leak-free.Keep your pool heater in good shape by replacing an old or damaged part with the Hayward Gas Valve Replacement.