24 UNC Threaded Connection

a trip is triggered by restricted airflow

The IP44 rated enclosure protects internal components from dust and splashing water

What models use the Reznor 40416 orifice

While designed for Sterling equipment

Weil McLain 383-500-620 Maintenance Kit Els PW 17895 24 UNC Threaded ConnectionProfessional heating contractors understand that scheduled service is the only way to maintain the combustion efficiency and operational integrity of high efficiency condensing units. The Weil McLain 383 500 620 Maintenance Kit is a critical OEM boiler part designed specifically for Ultra Gas Boilers, providing all the necessary components for a comprehensive annual teardown and inspection. This kit is compatible with Ultra 155, 230, 299, and 399