Look on the frame, passenger-side, just ahead of rear axle. It should have about 4-5 air lines attached.MH's generally use one of 3 brands, Meritor/Wabco, Bendix, or Midland/Haldex.
This is a new meritor/Wabco brand air dryer, after some road miles it will be dirty.
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA.
"We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln