Pilot assembly includes : Pilot bracket. Thermocouple. Aluminum tubing Length: 24"Copper Tube Thermocouple, 24 inch Aluminum tube Mounting thread： thermocouple inlet thread is 11/32-32 UNS, Pilot tubing inlet thread is 7/16-24 UNF fits many water heaters thermostats Gas Type: the orifice of aluminum pipe is natural gas and fits many but not all water heaters on the market Widely used : compatible with Desa, Reddy, All-Pro, Universal, NR, Sears, Remington and many other natural gas forced air heaters fit models: RLP55V, RLP125V, REM55PV, REM125PV, 85-FAC, 125-F, TB115, SPC-85, SPC125, BLP55V Water Heater Pilot Assembly Includes Pilot Thermocouple and Tubing, 24 inch Length Natural Gas