Feature●[Function] This thermal regulator can quickly heat water and keep the pool water temperature stable at a suitable temperature.●[Application] Thermal regulator kit is compatible with Pentair MasterTemp 125 200 250 300 333 400, compatible with Sta-Rite Max-E-Therm SR200 SR333 SR400 pool and spa heaters. Part Number Replace 77707-0010, 38000-0007S.●[Excellent quality] Made of high-quality metal, which can even effectively prevent corrosion and rust even in saline environment. Strenghen spring and rubber ensure a long service life.●[Installation] Located between the inlet and outlet water connections on the water manifold,as picture shows.●[Package includes] The product kit includes regulators, springs, and covers.Description