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Old 04-15-2016, 07:23 PM   #1
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Plumbing kitchen gray tank drain into front black/gray drain

Our 5er has 3 sewer drains.
The front one (easy access) is for the front bathroom black and gray tanks (seperate dump valves obviously)
The second one is for the kitchen gray tank and is under the dinette slide (and I have to crawl under the slide to connect a sewer hose for dumping, while already setup at camp)
The third is for the rear bunk 1/2 bath

I'm planning to remove the bayonet connector from the front drain, and replace with a 3" tee, and (possibly) remove the valve from the kitchen drain, plumbing that drain into the tee at the front drain, with a new dump valve closer to that drain.

The question is whether I can leave the flange from the backside of one of the dump valves, and just connect another flange to it, without the dump valve in-between ?
I haven't tried to dismantle it yet, and am not sure of how the interior surfaces of those flanges are, and thus whether I can safely just connect two flanges together (e.g.: is there enough space for the large washer/seal between the two flanges ... or too much gap, or no space at all ?)

So, to try to make my plan clearer: -

Remove dump valve from kitchen drain, leaving just the flange which is currently bolted to the dump valve
Connect a flange with a 3" spigot fitting directly to the existing flange
Connect a 90deg elbow with hub-to-hub fittings to that spigot (glued)
connect a length of pipe into that
connect a new dump valve to that pipe
Remove the existing bayonet fitting from the front drain, and replace with a 3" tee, with hub fittings
Connect the new dump valve into one inlet on the tee
Connect a new bayonet-spigot connector into the outlet of the tee


Thoughts ?
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Old 04-15-2016, 07:25 PM   #2
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I drew a picture



You can see where I'd want to connect the two flanges directly together, having removed the old dump valve
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Old 04-15-2016, 07:38 PM   #3
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My 5er has 3 drains. Front is bath gray, 2nd is black, and 3rd kitchen gray...
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Old 04-16-2016, 08:59 AM   #4
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Quote:
Originally Posted by CaptnJohn View Post
My 5er has 3 drains. Front is bath gray, 2nd is black, and 3rd kitchen gray...
I'm surprised that your front black and gray drains aren't already connected together like ours are
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Old 04-16-2016, 09:27 AM   #5
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Quote:
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I'm surprised that your front black and gray drains aren't already connected together like ours are

I should have said 3 tanks. All are connected to the same drain pipe. Pull black, then kitchen gray, then shower gray...
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Old 04-16-2016, 09:46 AM   #6
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Why not just leave the existing valve in place, open and remove the handle to prevent use?

Easy enough to undo the mod if ever needed and no worries about sealing the flanges together....

-OR-

Replace troublesome dump valve with a cable operated unit and mount the handle in easy reach. They also offer electric units...
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Old 04-16-2016, 12:29 PM   #7
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My galley tank handle was under slide....I changed the cap to one that has a garden hose attachment thread....then between it and valve, bored a hole in pipe, ran a length of pvc and hose toward front grey/black tank valve, added a 3" valve, and plumbed that into the side of grey/black tank outlet, between cap and valve, and now leave factory valve on galley tank open. But, if only needing to drain galley, I use that factory valve and a garden hose
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Old 04-16-2016, 01:27 PM   #8
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Quote:
Originally Posted by dieselbobcat View Post
Why not just leave the existing valve in place, open and remove the handle to prevent use?

Easy enough to undo the mod if ever needed and no worries about sealing the flanges together....

-OR-

Replace troublesome dump valve with a cable operated unit and mount the handle in easy reach. They also offer electric units...
It's not just that the valve is hard to reach, it's also that is hard to hook up the sewer hose, and I really don't want to have to carry around 3 sewer hoses and multiple tees
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Old 04-16-2016, 01:30 PM   #9
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I guess I could leave factory valve in place but open, just depends on angle/position between the two connections. The galley one currently protrudes further, so I'll see once I have the tee connector and will measure
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Old 04-18-2016, 12:05 PM   #10
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Does anyone know where I could buy 3" black ABS DWV pipe in small quantities

Lowes sell 5ft lengths (great) but you have to buy in multiples of 4 (and I only need under 4ft total), and they don't stock locally (so I'd have to get it delivered). Paying over $60 for 4 lengths of pipe, when I only need one isn't a great option.

They also (in theory) sell a 10ft length, but it's not stocked locally, and neither delivery to store, or parcel shipping are available


An amazon seller sells a 2ft length, but I don't think that's quite enough.

Ace Hardware don't stock ABS pipe, only PVC
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