GZKEFEIS Thermal Regulator and Manifold Bypass Valve Kit Compatible with Pentair MasterTemp and Sta-Rite Pool Spa Heaters, Replacement for 77707-0010 77707-0001 38000-0007S

["Precise Temperature Control — This thermal regulator and manifold bypass valve kit helps maintain stable pool water temperature by opening at the appropriate range, ensuring efficient heating performance for your pool or spa heater.","Effective Solution for Common Heater Issues — Addresses problems such as unstable water temperatures, frequent cycling, or slow heating. The complete kit restores reliable operation when replacing worn thermostat or bypass components.","Wide Compatibility — Designed to fit Pentair MasterTemp series (125, 200, 250, 300, 333, 400) and Sta-Rite Max-E-Therm / SR series (SR200, SR333, SR400) pool and spa heaters. Installs between the inlet and outlet connections on the water manifold.","Durable Materials — Constructed with high-quality, corrosion-resistant components including reinforced spring and O-rings, suitable for demanding pool and saline water environments to support long-term use.","Complete Repair Kit — Includes thermal regulator, manifold bypass valve, spring, clip, and necessary O-rings. Backed by GZKEFEIS customer support for a smooth installation experience."]