Black tank dump valve replace

[cdigger67]

Hi all. I have a 2018 Outback 330RL bought new. We are fulltimers. Recently the black tank valve handle has been leaking where it goes into the valve. I tried replacing the valve but could not get enough separation from flanges to get the old valve out. Is there some trick to this or is it something I need the professionals to do?

[wiredgeorge]

Originally Posted by cdigger67

Hi all. I have a 2018 Outback 330RL bought new. We are fulltimers. Recently the black tank valve handle has been leaking where it goes into the valve. I tried replacing the valve but could not get enough separation from flanges to get the old valve out. Is there some trick to this or is it something I need the professionals to do?

There are lots of configurations for the tanks but on my camper, the tank is attached by large self taping screws on a rail that runs laterally across the frame. I suspect your camper may be the same. You would have to remove the screws and push the tank back so that the valve clears enough for replacdment.

[cdigger67]

Thanks, I will look into that.

[wiredgeorge]

Take special caution when working on black tank as it will be hard plumbed to the pipe leading to the toilet flange. It won't move much but perhaps enough to get the valve in. Also keep in mind if you do get some separation that you need suitable eye/face covering.

[chuckster57]

I use 2 people and leg power. Sometimes I have had to undo both the black and gray to get enough movement.

[cdigger67]

Originally Posted by chuckster57

I use 2 people and leg power. Sometimes I have had to undo both the black and gray to get enough movement.

All of the YouTube videos I've seen show valves that are really easy to access and get clearance to separate. Figures mine is really tight and almost impossible to spread apart. Thanks for your help Chuckster.

[chuckster57]

Originally Posted by cdigger67

All of the YouTube videos I've seen show valves that are really easy to access and get clearance to separate. Figures mine is really tight and almost impossible to spread apart. Thanks for your help Chuckster.

In all my years as a tech, the number of “easy” times is less than a handfull.

[Carl n Susan]

Cut about 1/2" out of the sewer line, either by the tank or after the Wye, which will give you room to change the valve easily. Use a 3" No-Hub rubber connector to cover the gap when you are done.

[chuckster57]

Originally Posted by Carl n Susan

Cut about 1/2" out of the sewer line, either by the tank or after the Wye, which will give you room to change the valve easily. Use a 3" No-Hub rubber connector to cover the gap when you are done.

That works too, but when it’s a customers RV…..I have done that 1 time

[cdigger67]

Originally Posted by Carl n Susan

Cut about 1/2" out of the sewer line, either by the tank or after the Wye, which will give you room to change the valve easily. Use a 3" No-Hub rubber connector to cover the gap when you are done.

That sounds like a possibility. Thank you 😊

[wiredgeorge]

The main sewer pipe that goes into our septic system runs from one end or our home to the other where it exits. This is big pipe and I had to cut in with a tee to add a line from the laundry room I built. I cut the pipe and added a tee and used one of those rubber pieces to join two straights (a new one out of the tee and another into the existing line. They work fine and are the only solution when you can not otherwise move the existing pipe which is fixed in a number of locations.

[cdigger67]

Originally Posted by wiredgeorge

The main sewer pipe that goes into our septic system runs from one end or our home to the other where it exits. This is big pipe and I had to cut in with a tee to add a line from the laundry room I built. I cut the pipe and added a tee and used one of those rubber pieces to join two straights (a new one out of the tee and another into the existing line. They work fine and are the only solution when you can not otherwise move the existing pipe which is fixed in a number of locations.

Thanks for all your help. I'm going to try a 3" rubber connector. It seems like that will be the best way to get things fixed.

[FordF350]

Originally Posted by cdigger67

Thanks for all your help. I'm going to try a 3" rubber connector. It seems like that will be the best way to get things fixed.

I did the same . Cut the pipe and added a 3” rubber boot . Also use some Vaseline to keep rubber seals in place for the installation . Nothing more frustrating then assembling the new valve only to find that the new rubber seals have moved or are pinched causing the valve to still leak

[Firecapt176]

I just bought this and it is very helpful.
https://www.etrailer.com/RV-Waste-Va...terra/T50.html

[cdigger67]

Originally Posted by Firecapt176

I just bought this and it is very helpful.
https://www.etrailer.com/RV-Waste-Va...terra/T50.html

Yes that would be helpful but my black and gray have the same exit pipe. Tomorrow I am renting a reciprocating saw - Home Depot. Going to cut about 1 in. from the gray side which will give me room to remove black valve, replace and then replace gray valve which also has a small leak at the handle. Thanks

[cdigger67]

Originally Posted by FordF350

I did the same . Cut the pipe and added a 3” rubber boot . Also use some Vaseline to keep rubber seals in place for the installation . Nothing more frustrating then assembling the new valve only to find that the new rubber seals have moved or are pinched causing the valve to still leak

Thanks for your reply 👍

[chuckster57]

If you’re doing both the black and gray, can you take both apart at the same time? I use axle grease to hold the seals in place.

[rhagfo]

Originally Posted by cdigger67

Yes that would be helpful but my black and gray have the same exit pipe. Tomorrow I am renting a reciprocating saw - Home Depot. Going to cut about 1 in. from the gray side which will give me room to remove black valve, replace and then replace gray valve which also has a small leak at the handle. Thanks

Your setup is like mine, I think my grey valve leaks slightly, so added the valve at the end of the outlet. I have to believe the two tanks, valves, and Wye pipe were installed as a unit.

[cdigger67]

Job all done. Replaced both valves after cutting pipe on gray side. Didn't have enough room for 3in. rubber connector so I trimmed it to 2in. All good with no leaks. Thanks for all the help. Keystone forum is way better than YouTube.

[bustersdaddy]

I have a 2014 Keystone 319 RLS with the same black tank valve issue, There is literally no movement to slide the new valve in place. I am going to attempt it again when it warms up, but it is a LOUSY design. BTW: Keystone was no help.