David, on my coach I have an air preasure control valve and air preasure guage in the compartment below the toilet. I had a sudden air leak about 5 monthes ago and discovered that the air preasure control valve went bad. I got a new one and now carry a spare one because the control valve is used for the tag axel air bags.
The air preasures for the toilet on my coach is 60 pounds and the tag 40 pounds.
Wally
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