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Pentair Gas Conversion Kit, Propane to Natural Gas, for 333K Heater | 77707-1421 Lounge Chair Blue-White Industries is a trustedWhat This Part Is Used For Pentair 77707 1421 Conversion Kit LP to NA 333K is a fuel conversion kit for compatible 333K BTU Pentair heaters. It converts the unit from LP to natural gas. Why This Part Matters Proper fuel configuration ensures safe combustion and reliable heating. A correct conversion prevents ignition problems and protects internal components. Using the designated kit supports proper heater performance. Key Features and Specifications