this factory kit includes a 1/4" to 1/2" NPT reducing bushing

utilizing the correct Reznor 39651 orifice is critical for achieving optimal flame patterns and preventing nuisance lockouts

ensuring a precise fit on square stems

ensuring stable voltage for ignition boards

Maxitrol 325-5-1 Regulator Els PW 17895 this factory kit includes aThe Maxitrol 325 5 1 is a high performance 1 inch NPT gas regulator engineered for residential, commercial, and industrial pounds to inches reduction. Featuring a lever acting design with a high leverage valve linkage, this unit provides the positive dead end lockup required for modern high efficiency appliances. It handles a 10 PSI max inlet pressure and manages a 325,000 BTU hr capacity, making it a reliable choice for main burner and pilot load