DESIGNED TO: specifically prtect the hot water supply system where over-pressure conditions are likely to occur as a result of thermal expansion COMPLETELY AUTOMATIC: the FWL-2 reseals after pressure relief INSTALLATION: the valve may be installed directly on the tank or in a tee and is appropriate for either side (hot or cold) of the water heater PRODUCT SPECIFACTIONS: FITTED WITH A BRONZE BODY AND HAS BRASS AND STAINLESS STELL INTERNAL PARTS, A SILCONE SEAT DISC, AND A STAINLESS STEEL PRESSURE SPRING