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Old 10-11-2021, 11:45 PM   #1
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Amherst , Massachusetts
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Sewer Inlet Insulation

I'm installing a sewer hookup on my property to be able to use my Airstream as a guest house when we're not on the road. I'm in New England and want to have it available year round, including grey water out.

I intend to use PVC pipe wrapped in heat tape and insulation for the run from the trailer to the inlet. I think this is common practice and I've had success with similar setups in the past.

My question comes with the design of end the sewer line I'm installing to connect to my septic system. Is it enough for the opening to be even with ground level as long as it immediately drops vertically below the frost line, say 3'?

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Or should I have the pipe terminate below ground level in some sort of box which can be insulated?

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Old 10-12-2021, 01:04 AM   #2
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Lots of sewer cleanouts have the cap slightly above ground. It doesn't matter as far as winter goes because the water doesn't stand in the pipe.

A good reason to put the cleanout slightly below grade in a concrete, metal or plastic box is so it won't be damaged by lawn equipment or if you drive over it.
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Old 10-12-2021, 12:33 PM   #3
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The box is more initial work, but has multiple advantages: cleaner look above grade (and easier to mow over if it's in the grass), easier to access pvc for repairs, you can store a flexible hook up hose in the box (in the ground), etc.
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Old 10-15-2021, 09:56 PM   #4
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Thanks you both for your advice. So Iím not going to worry about freezing, but Iíll consider a box anyway for the reason you cite. Cheers!
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Old 10-15-2021, 10:06 PM   #5
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If you place the inlet below ground level it is possible for rain water to drain into the pipe. Depending on your location this could be a great amount of water. This could be a very big issue if you are on a septic system.


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