?The "PILOT ASSEMBLY" is a part of the heat exchanger unit. This Pilot Assembly is an replacement for Rheem part number SP20824, which is used with some Rheem gas water heaters. This Pilot Assembly may be compatible with other brand gas water heaters. Like Model SP20754,SP21058. ? Replace for RHEEM SP20824 Pilot Assembly Replacement Kit H/W - NG. But Include the LP Orifice for LP Propane Water Heaters as well. ? The Pilot Assembly includes the components needed for a routine replacement of the unit in residential/light commercial applications which include outdoor gas-fired system. The kit supplies the following components: Pilot Kit NG, , Burner LP Orifice, Screws, Orange Outdoor Flame Arrestor with Mounting Hardware Includes: thermopiles, sparker, and pilot assembly. The part replaces Rheem part SP20824 (RE523121). ? The part compatible for Rheem Sp20824 pilot assembly replacement kit HW is an replacement for heating equipment from Rheem. It is used in place of the old assembly indicated in this style number, and can be one of the following:The Rheem SP20824 pilot assembly replacement kit, hangswallow ignition system components; pilot gas valve, spark module with ignition pulse transformer, and flame switch. ? Each Piece are tested with ignition and welding , leaking test. The designed head is better than the original one with higher thermo milivolt and stable to open the gas control valves. Thermopile life can be over 40000 times.