Monitor 441 Question

[grafton]

I'm trying to reinstall my Monitor 441 and thought I remembered a O ring attached to the flue pipe where the heater slides in. Am I correct about the O ring and if so does anyone know the specs?

Thank You

Jerry

[hawkins111]

exhaust pipe O rings

That part is referred to as Flue Pipe “O” ring, Part # 4015. It is approximately 3MM around and 40MM outside diameter. From Monitor it costs $6.00.

Tom