I also am a firm believer that mass produced assembly line rv manufacturers such as Keystone place many electrical and plumbing fittings in an general location based on material on hand at the moment. It is pretty lame but a reality in the rv business.
If you are looking for your waste tank valves, follow the drain line into the belly to centerline and you will find them. Don't be afraid to remove a square of belly material. You can get replacement pieces to patch it from most vinyl graphics sign shop. That's what I did and sealed it with gorilla tape. Now I have an access hatch for the next time I have to service the valves. No biggie.
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