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**wingnut60** · 01-27-2017, 02:27 PM

I believe the grey tank is under the black tank, as far as where they are located. You will have to remove the plastic housing where the dump line emerges under the belly to access the valve. Cut it carefully, as it was placed there before the lines were glued up and there is no way to take it off without cutting it. You may be able to take the screws out and move it to see the valve. Cut it with the idea you will want to put it back...
Hopefully, some one else has already done this and can help you more.
How long have you had the unit? Mine is #1869, built not too long after yours was.
Joe

01-27-2017, 02:27 PM	#2
wingnut60 Site Team Join Date: Sep 2005 Location: Where we park it Posts: 2,838	I believe the grey tank is under the black tank, as far as where they are located. You will have to remove the plastic housing where the dump line emerges under the belly to access the valve. Cut it carefully, as it was placed there before the lines were glued up and there is no way to take it off without cutting it. You may be able to take the screws out and move it to see the valve. Cut it with the idea you will want to put it back... Hopefully, some one else has already done this and can help you more. How long have you had the unit? Mine is #1869, built not too long after yours was. Joe __________________ 2016 Tiffin 40 QBH 2015 38RSSA, traded 2005 TK3 #1869, 10 yrs of memories, 2017 F450 KR--one more Ford is it 2009 F450 4x4-died; 2010 F450-retired