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Old 04-13-2010, 03:38 PM   #1
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The "P" or "S" trap (plumbing)

We have two 30-gallon gray tanks slung under the Overlander, each with a standard unthreaded opening for a black ABS pipe. On the galley side, it's easy enough to plumb the kitchen sink down to the tank with a normal ABS "S" trap. On the head side, I'd prefer to avoid raising the shower floor any more than necessary (to allow room). Even squeezing in a shallow "P" trap will force me to raise the floor.

These are only gray water tanks so the issue is slightly different than in a household. On the other hand, having some kind of water (or mechanical") seal does afford certain advantages. Any thoughts, master plumbers?
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Old 04-13-2010, 04:03 PM   #2
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I ran a 1/2 hose and a serie of reducers from the shower drain back up thru the floor to a small jetflo pump. Pumps the shower into the gray tank, which I then use to flush my marine head. I set it up so I can drain it with a garden hose connector also or on to the ground. Not enough head room to raise the floor.
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Old 04-13-2010, 08:14 PM   #3
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Grey water can have very nasty odor , you still need some form of trap. Fernco makes rubber traps that may work for you , or even a rubber hose with a low enough bend to stay filled with water.
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Old 04-14-2010, 11:24 AM   #4
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I can run a shallow "p" trap, but it will require cutting some floor or building an elevated shower drain pan.
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Old 04-14-2010, 11:36 AM   #5
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Me, I'd cut the floor to make room for the trap. You can then box it, and insulate it, if you want.
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