Originally Posted by R1Kirby
Found it. It is located on the chassis frame behind the generator. Why there I'll never know. Thanks for all the input.
Yours isn't the only "odd" spot. On our previous coach, a '99 Fleetwood Bounder 34v, it was located behind a panel, that was held on by screws, behind the coach batteries, behind the left front tire. Not all that hard to get to but, a bit of pain. Fortunately, I had almost "0" leaks for the seven years we owned this coach so, needing to top it off was seriously rare.