Re: A/C Condensate Drain
Reply #11 –
Dometic Drain Kit # 3107688.016 are the kits that were used on mine Amazon.com: Dometic 3107688.016 Drain Kit: Automotive has a good image of them.
The retro-fit is basically a double stack of AC roof gasket (else the cups don't clear the roof) and some additional gasket for support.
On ours MOT turned the cup outlets outboard and ran a drain line down each side of the roof, Tee-ing in to the other AC units as it went as shown in the attachments. The kit was really designed to be used as shown in the other attached images, but maybe concern over leaks or the curved roof had them install them 180 to that (also attached). At least that way if they or a connections fails the leak is generally outside the coach.
The only problem I've had was the hose barb on the cups breaking off. It seems the plastic used on them is not UV stabilized so they degrade with time. On replacement, they were painted to help protect them. I've not had the backwash effect that I've heard some report when stopping causing the water in the lines to flow back in the the pans and then into the coach. I've often though about adding a simple checkvalve to the setup to prevent that, but since I've not the problem, I've not pursued that.
Anyway YMMV
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