For contractors handling gas pressure testing

you need a drop-in replacement that matches manufacturer specs exactly

always replace the 47-21900-13 with the exact specified manual reset component

it is a flanged detector base that includes a decorative ring to provide a clean finish against the ceiling surface

Weil McLain 383-500-055 Sensor Kit Els PW 17895 For contractors handling gas pressureIdentify and resolve lockout conditions with the Weil McLain 383 500 055 Flue Temp Sensor Kit. Designed for Weil McLain Ultra Series 1 and 2 residential gas boilers, this genuine OEM replacement part is essential for monitoring exhaust gas temperatures and maintaining high efficiency performance. When a flue temperature sensor fails or provides erratic resistance readings, the boiler control module typically triggers a safety shutdown to prevent heat