Water Heater Pilot Assembely Includes Pilot Thermocouple and Tubing Natural Gas NATURAL GAS WATER HEATER PILOT ASSEMBLY AND THERMOCOUPLE STANDARD 24" LENGTH FITS MANY BUT NOT ALL WATER HEATERS ON THE MARKET. SYSTEM MUST BE CHECKED FOR LEAKS BEFORE OPERATION WARNING !!! ONLY QUALIFIED SERVICE PERSONEL SHOULD ATTEMPT TO REPAIR GAS EQUIPMENT