Unlike standard rubber seals that fail under thermal stress

With 1/4" barbed connections optimized for 3/8" OD polyethylene tubing

this limit control is a standard replacement part for many Miller and Intertherm M1

Once the plenum cools to the 160°F reset temperature

Weil McLain 383-500-020 Inspection Glass Kit Unlike standard rubber seals thatFor high efficiency boiler maintenance, the Weil McLain 383 500 020 Inspection Glass Kit is the essential OEM solution for monitoring combustion and flame quality in Ultra Series 1 and 2 boilers. This complete assembly is critical for identifying potential burner issues or soot buildup without compromising the sealed combustion environment. As a professional grade boiler sight glass replacement, it includes the high temperature borosilicate glass, a