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Old 12-30-2020, 02:45 PM   #1
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THOR #20476
Rear bath sink drain

I have a Challenger 37fh (with the 1 1/2 baths) (2 black tanks and 2 grey tanks). The sink in the rear bath drains into the black tank rather than the grey water tank. This causes the black tank to fill quicker and when boon-docking limits the time til black tank needs dumped. To minimize the effects we just do not use that sink when boondocking.

Has anyone redirected this sink drain to the grey water tank? If so, how did this modification work?

I am thinking of adding a y-valve to direct this water to the grey tank or just permanently changing the drain line to the grey water tank.
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Old 12-30-2020, 03:45 PM   #2
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We have a Challenger 37LX. Bath and a half, with dual black and dual grey tanks like yours. I find that my grey tanks fill up way before my black tanks do. We have gone 10 days before dumping the black tanks, and even then I donít think they were completely full.

It is just my wife and myself, so if you have more people on board that might explain why yours are filling so fast.

Iím actually glad that the lavatory sinks empty into the black rather that the grey tanks.
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Old 12-30-2020, 05:16 PM   #3
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FYI...
there's a reason why all RVs drain the bath sink into the Black tank
it's to add a little soapy sink water to the solids

personally, I would not change it
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Old 12-30-2020, 07:38 PM   #4
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Quote:
Originally Posted by ptylerp View Post
I have a Challenger 37fh (with the 1 1/2 baths) (2 black tanks and 2 grey tanks). The sink in the rear bath drains into the black tank rather than the grey water tank. This causes the black tank to fill quicker and when boon-docking limits the time til black tank needs dumped. To minimize the effects we just do not use that sink when boondocking.

Has anyone redirected this sink drain to the grey water tank? If so, how did this modification work?

I am thinking of adding a y-valve to direct this water to the grey tank or just permanently changing the drain line to the grey water tank.
you probably have rear axels to jump over and we all know which way that runs.
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Old 12-30-2020, 08:03 PM   #5
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Originally Posted by taylorbob1 View Post
FYI...

there's a reason why all RVs drain the bath sink into the Black tank

it's to add a little soapy sink water to the solids



personally, I would not change it


They donít ďallĒ drain into the black tank. Some do and some donít. If you want to know either get a diagram from the manufacturer or, after draining the grey and black tanks run the bathroom sink faucet for a few minutes and see which tank it comes out of.
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Old 12-31-2020, 04:29 PM   #6
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Taylorbob1 is right it helps draining black tank we've also have 37fh and always fill rear gray from showers well before black, both tanks are 40 gallons.
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Old 12-31-2020, 06:55 PM   #7
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I don't know if we've had this question before.
If we haven't, a slight change in personal habits might be the answer.

Also:
If you have a hard pipe over the axle I think a $18 water flow sensor, a $78 macerator pump and a garden hose would make me a lot less worried about some wonky ridgid line in a really stupid place.
And
My rv has room for two more tanks, another 100gallons+-underneath.
A 40 gallon tank is about $140....

I considered it and measured for it.
It turns out we don't have the need.
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Old 01-05-2021, 09:16 PM   #8
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I just checked the schematics for my 2018 Vegas 24.1 and the bathroom sink and kitchen sink and shower drains to the grey tank. The toilet is the only item that drains to the black.
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Old 01-05-2021, 09:39 PM   #9
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Originally Posted by gte534j View Post
I just checked the schematics for my 2018 Vegas 24.1 and the bathroom sink and kitchen sink and shower drains to the grey tank. The toilet is the only item that drains to the black.
Those schematics are not 100% accurate. When we got the Gemini I was trying to figure out why the black tank filled so quickly. The schematic clearly showed both the kitchen and bathroom sinks draining into the grey tank. A physical inspection clearly showed the drain line from the bathroom sink going directly into the black tank. I just learned to live with it, used the bathroom sink very judiciously.
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Old 01-09-2021, 08:55 PM   #10
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Black water vent

The reason that they use the bathroom sink for the black tank, is that they both need roof vents. The blackwater vent passes near the sink, thus giving them both a common roof vent.
If you separate the drains, you will need to vent whichever now does not have a vent.
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Old 01-09-2021, 10:41 PM   #11
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Quote:
Originally Posted by davidspixx View Post
The reason that they use the bathroom sink for the black tank, is that they both need roof vents. The blackwater vent passes near the sink, thus giving them both a common roof vent.
If you separate the drains, you will need to vent whichever now does not have a vent.


My bathroom sink uses a studervent under the sink and drains into the grey water tank. Same as the kitchen.
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Old 01-09-2021, 11:36 PM   #12
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When the bathroom sink drains to the black water tank, is it probable that the adjacent shower also drains to the black water tank, instead of the grey water tank? The head is located between the sink and the shower in a dry bathroom.
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Old 01-10-2021, 12:32 AM   #13
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Quote:
Originally Posted by davidspixx View Post
The reason that they use the bathroom sink for the black tank, is that they both need roof vents. The blackwater vent passes near the sink, thus giving them both a common roof vent.
If you separate the drains, you will need to vent whichever now does not have a vent.
Ummmm, no. You only need a roof vent for each tank. Sinks normally have Air Admittance Valves (AAV) these days.
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Old 01-10-2021, 12:42 AM   #14
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Hi ptylerp

The reason why the bathroom sink drains into the black tank is to add additional water to the black tank to help move all solids out when you do a dump. The black tank usually needs a little more water to help move everything out and not leave solids to build up. Your kitchen sink and shower usually go into the grey tank.

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