It acts as a restrictor to optimize the burner-to-vent transition

The brown color indicates a 1-3

those must be sourced separately or reused from the previous assembly

Pressure-Sensitive Interrupter: Features an internal safety mechanism that disconnects the capacitor at end-of-life to prevent case rupture

While they may physically fit other pilot burners

Reznor 103054 Transformer Els PW 17895 It acts as a restrictorWhen you are out in the field servicing a Reznor unit heater, having a high reliability control voltage source is non negotiable. The Reznor 103054 Transformer is an OEM spec component engineered specifically to step down standard 120V primary voltage to a stable 24V secondary output. Rated at 20VA, this class 2 transformer provides the necessary current to power thermostats, ignition modules, and limit switches without the voltage sag experienced