The entire base plate should un-thread from the pipe if you have to replace it. I think they come with a rubber sponge type of gasket; at least that’s what I remember putting on ours. It may even have a flange on it if my memory serves me correctly.
Not that big of a job!
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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