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Old 10-14-2020, 08:29 PM   #1
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Tanks unmarked

Hello,
I own a 2018 sanibel 3751 which contains a grey front tank, grey galley tank, and black tank.
Outside in my storage area beneath are my 3 T-handles. One closest to me is grey, followed by a chrome handle, followed by a second grey handle.

These handles are unmarked and through process of elimination I believe that maybe the furthest grey handle opens the galley which drains to the black and by opening the black you drain both? I can not tell entirely can anyone provide insight on this matter?
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Old 10-15-2020, 09:36 AM   #2
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If you can see the pipe going into or out of the actual valve, gray water tanks are usually drained using 1-1/2" pipe with same size valve and black tanks are drained using 3" pipe.
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Old 10-15-2020, 09:41 AM   #3
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welcome to the forum its a great place to get your questions answered
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Old 10-15-2020, 01:03 PM   #4
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Originally Posted by TitanMike View Post
If you can see the pipe going into or out of the actual valve, gray water tanks are usually drained using 1-1/2" pipe with same size valve and black tanks are drained using 3" pipe.
I can not see which handle relates to which pipe unfortunately. They are not on the pipe themselves like a normal RV. Ive attached a photo of the handles.
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Old 10-15-2020, 01:13 PM   #5
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If you have two sewer ports to connect a sewer hose to, then one valve is for the galley and usually it has its own separate sewer port. The second sewer port is for the black and shower/bath sink drain and those other two handles allow those tanks to drain out the 2nd sewer port. When pulling the 2nd grey tank handle, it doesn't drain the grey tank into the black, it simply drains it out the sewer port.

A simply way to tell which handle is which... put some blue food coloring in the toilet and run some water then pull the handles one at a time and see which one allows blue liquid out.

Put some red food coloring in the kitchen sink drain and run some water down the drain and see which handle lets out red liquid... and so forth.

BTW... those handles ARE somewhat marked the chrome handle has a B near it so I'd assume that is the black. The first handle has a G and I don't know if that stands for grey or galley?

The farthest back handle I don't see any lettering but there is a decal there. I can't read what it says.
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Old 10-15-2020, 06:11 PM   #6
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Originally Posted by 5picker View Post
If you have two sewer ports to connect a sewer hose to, then one valve is for the galley and usually it has its own separate sewer port. The second sewer port is for the black and shower/bath sink drain and those other two handles allow those tanks to drain out the 2nd sewer port. When pulling the 2nd grey tank handle, it doesn't drain the grey tank into the black, it simply drains it out the sewer port.

A simply way to tell which handle is which... put some blue food coloring in the toilet and run some water then pull the handles one at a time and see which one allows blue liquid out.

Put some red food coloring in the kitchen sink drain and run some water down the drain and see which handle lets out red liquid... and so forth.

BTW... those handles ARE somewhat marked the chrome handle has a B near it so I'd assume that is the black. The first handle has a G and I don't know if that stands for grey or galley?

The farthest back handle I don't see any lettering but there is a decal there. I can't read what it says.
Hey thanks!
I put the B and G there myself after playing with them. Thats what I concluded so wrote for reference. The food coloring idea is a great one, will be trying that asap
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