Replacing Black and Gray Drain Valves

[Tom Warner]

Sounds exactly like mine. You decide which valve you want to install
(either electric Drain Master (the ones I installed), or Dupree air valves)
and then buy ten foot of 3" ABS black pipe, three 90 degree elbows, a
sanitary T, 3" adapter male thread on one end female slip joint on the
other, drain end to accept the cap, All purpose pipe cement. A can of
special pipe dope compatible with PVC pipe.

The tank towards the front of the coach is the grey water tank. Cut the
pipe off flush with the first elbow so that as much as possible of the PVC
(white) pipe is still coming out of the tank. You will glue a 90 degree
elbow to this later.

The tank towards the rear is the black water tank. You probably have a
Dupree manual valve on it. Cut the valve off as near the tank as you can
comfortably get. If your tank is like mine there is a PVC junction block
welded to the tank with female 3# threads.After you cut off the valve you
can unscrew it from the tank. You will thread in the new ABS or PVC 3" male
thread into it. Sometimes its hard to find a ABS one but the PVC one will
work fine.

I believe the electric drain valves work best on the forward control
coaches since they can be installed horizontally and you can still get
easily to the manual override functikon. I dry fitted the pieces together
first making sure I allowed enough pipe to extend the full depth of the
joints. Then I put a short length of masking tape across each joint to mark
exactly where they should be aligned when gluing them up.

The directions for installing the switches come with the valve although I
made my own for about $5 instead of $50.

Tom
1982 FC35
Vernon Center,NY



At 07:48 PM 5/14/2005 -0500, you wrote:
>Tom. Sounds like you have the idea but, to clarify, here's what I
>have. Mine is a left side bath and the bath is about in the center,
>probably a foot or two in front of center, of the coach. The exterior
>plubing exits the bus in front of the bath room so that the "beginning" of
>the lines would be between the restroom and driver's seat. The lines then
>proceed toward the rear of the bus ending somewhere between the bathroom
>and kitchen which is also on the left side. Thanks,
>Henry@... 1979 FC/SB 35, McAllen, Tx.
>
>
> Date: Fri, 13 May 2005 23:35:22 -0400
> From: Tom Warner
>Subject: Re: Replacing Black and Gray Drain Valves
>
>Henry do you have a side bath with the dump tubes running down the side and
>ending just in front of the drivers side middle bay?
>
>tom
>1982 FC35
>Vernon Center,Ny
>
>
>
>
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