Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 10, 2025 ...

Few days ago I was going to flush the black and grey tank. As I mentioned in this post, the connector at the end of sewage hose is thetford not the regular valterra.

I bought the Valterra Universal Adapter T052285VP



The space is really tight.

I am unable to fit in the 45 elbow downward. I can only connect the 45 elbow upward. That is not optimal at all.



I then bought Thetford 01665 Curved Hose Adaptor.

It is going to work if I connect the hose using clamp. But I don't want to cut my new camco Rhino flex hose.

So I decide to switch the connector out to the regular Valterra connector. Also both the black and grey tank valve are leaking. So it is a good time to change both out.

The biggest challenge is the space. It is so tight that I can't even put my wrench in place. Especially with the fiber glass board in place. @stump said he removed those boards just to gain access to the valve. I think that is great idea. So first step is to remove those board. I can have better access to the valve. It is still very tight. When they design the coach 30 years ago, replacing valve was definitely on top of there list. The bolt and nuts at the bottom right of the valves are pain in the *** to remove. It was very struggling.

With enough patience, I am able to get both valves out. I thought that is the hardest part. But I didn't realize that the installation of the new one is even harder. 






There are many posts mentioned about cut the old Thetford connector out. I was not sure what does it mean to "cut" it out. I read a post about using a hot air gun to remove it. So that was I tried first.


With enough temperature, the white materials used by the thetford connector turn into very sticky material. It is not easy to separate them from the black ABS hose. It is going to take forever to complete separate them. So I decide to cut the connector out.
That was so much easier . Just 5 minutes with a hacksaw, it is done.

Then use the Oatey 30889  ABS cement to glue the Valterra T1029-2 to the other end. The adapter is changed from thetford to valterra. 

Installing the new valves were a little bit tricky, I read from some posts that some plumb silicon grease can help keeping the gasket in place while installing. I use Danco Silicone Facet Grease.

The biggest challenge is to install the bolts and nuts. Especially the lower side of the bolts and nuts. There is no space at all. I have to take off my glove to use bare hand blindly trying to start the thread to the bolt. It is almost impossible. I think the later coach design take care of this issue. Looking at the picture, there is much more space around the waste water valve to work with.

I didn't take any picture since my hand get so dirty as you can imagine.

Eventually, I got all the bolts and nuts tighten. Tested with some water. It seems no leakage at all. I hope I don't have to deal with replacing both waste water valves any time soon.

I converted mine about 5 yrs ago while adding the third valve. Mine works with the door closed if need be but the only time it is connected is when I am dumping.  I added an aluminum pan under the hidden valves to catch any leakage.  So far it is staying clean. I like the hose options for this connector. Mine have caps on both ends and collapse to about 40" long from 10 ft stretched out.

Amazon.com: Valterra 20-Foot Dominator RV Sewer Hose Kit, Universal Sewer...