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TT_Vert · 05-31-2023, 07:54 PM

This will apply to the 310/320 series and i'm sure many more. The manual states this is a 1/2" inlet. The issue is the 1/2" braided hose I got has the rubber gasket very close to the end of the threads (You will see in the pic). I assume this is to allow a thin walled nipple to seal well. But when you have a thicker walled fitting AND it has the first 1/8" w/ no threads I am only threading on about 1 thread which I don't like. I hope this makes sense and hopefully the pic will help. What water hose did you guys end up with?

Dave

MrMark52 · 06-01-2023, 03:36 AM

A couple of thoughts -

1. Use a sharp box knife and cut that leading protrusion off of the PVC fitting. This should allow a better capture of the threads.

2. Switch to using a PEX connector.

Had a similar thing occur on a friends trailer RV last week - that trailer had a quick release outdoor shower attachment that the hose connection from inside the coach was poorly assembled. I happened to have a 1/2” PEX faucet coupler in my box but the rubber seal washer wouldn’t allow it to thread either.
But as opposed to what you have pictured, the male side wall fitting didn’t have a beveled ID to allow the washer to fit into and seal against. I used a sharp box knife to cut the smoothest bevel inside of t fitting.
It took some umpf, but I got the threads started and the assembly tightened together with several turns of threads.

Isaac-1 · 06-01-2023, 04:52 AM

I installed a Dometic 320 about 5 years ago on our coach, and I think the hose I used was an Ace house brand hose from the local hardware store.

TT_Vert · 06-01-2023, 07:34 AM

Quote:

Originally Posted by MrMark52

A couple of thoughts -

1. Use a sharp box knife and cut that leading protrusion off of the PVC fitting. This should allow a better capture of the threads.

2. Switch to using a PEX connector.

Had a similar thing occur on a friends trailer RV last week - that trailer had a quick release outdoor shower attachment that the hose connection from inside the coach was poorly assembled. I happened to have a 1/2” PEX faucet coupler in my box but the rubber seal washer wouldn’t allow it to thread either.
But as opposed to what you have pictured, the male side wall fitting didn’t have a beveled ID to allow the washer to fit into and seal against. I used a sharp box knife to cut the smoothest bevel inside of t fitting.
It took some umpf, but I got the threads started and the assembly tightened together with several turns of threads.

Yeah I may have to do just that.

Quote:

Originally Posted by Isaac-1

I installed a Dometic 320 about 5 years ago on our coach, and I think the hose I used was an Ace house brand hose from the local hardware store.

I have a normal water supply line, the issue is the inlet fitting has an unthreaded shoulder which is causing me to have very little thread engagement.

Dave