【SUPPORTED MODELS】: This control board kit is compatible with Mastertemp models 200 250 300 400 compatible with Sta-Rite Max-E-Therm heaters SR200NA SR333NA SR400NA SR200HD SR333HD SR400HD, part number 460805. It is also compatible with the full range of NA and LP series pool and spa heater electrical systems. 【ORIGINAL EQUIPMENT MANUFACTURER (OEM) REFERENCES】: Our control board kit is identified by OEM part number 42002-0007S 461105, while the switch membrane pad corresponds to OEM part numbers 42002-0029Z and 472610Z. 【SUPERIOR QUALITY】: Manufactured with premium FR-2 copper foil laminate, enhanced solid-state capacitors, meticulous soldering techniques, and a robust SR waterproof coating, this control board kit ensures superior insulation, moisture resistance, and protection against leakage. It delivers reliable heating performance, quickly adjusts temperatures, and maintains consistent control for an optimal swimming experience. 【SIMPLIFIED INSTALLATION】: The process begins by de-energizing the unit and accessing the existing circuit board through the heater's top panel. Disconnect the membrane pad and detach the wire connector from the old board to facilitate the replacement. (more installation guide, please check the product description) 【POST-PURCHASE SUPPORT】: Our commitment to excellence in customer service includes round-the-clock support. This control board kit is compatible with Mastertemp models 200, 250, 300, and 400, as well as part number 460805. It is also compatible with the full range of NA and LP series pool and spa heater electrical systems.