Thread Tools Search this Thread Display Modes
Old 06-14-2019, 04:10 PM   #1
1 Rivet Member
1976 31' Sovereign
Hubbard , Ohio
Join Date: Jan 2018
Posts: 5
Black and Gray water tank valve replacement

We have a 1976 Airstream Land Yacht and we are working thru the mess!! gray water tank was full of leaves, acorns etc. We have both of them leaking on the valve.( we suspect that is the issue) My question is what is required to replace the valves? Do we have to drop the belly? is there an easy way to do this? We filled them several times and emptied them out. We are going to try soapy water and open and close the valves next to see if that helps. If not its going to be a valve replacement correct? Any help would be appreciated.

Anairstream2 is offline   Reply With Quote
Old 06-14-2019, 07:12 PM   #2
Rivet Master
1995 25' Excella
xxxxx , xxxxxx
Join Date: Apr 2015
Posts: 1,655
My manual says the AS way is to cut a hole in the belly pan, replace the valves, and cover the hole with a cover plate....That is how I did mine.

CRH is offline   Reply With Quote
Old 06-14-2019, 09:23 PM   #3
Rivet Master
Belegedhel's Avatar
1973 21' Globetrotter
Houston , Texas
Join Date: Sep 2009
Posts: 2,582
Welcome to the Forums!

Well, once you get access to the valve assembly, you can disassemble it and try just replacing the rubber seal elements. These might not even be available for what is possibly a 40+ year old valve, and if they are, disassembling the valve after sitting for 40 years may not be feasible either.

Good luck!
Belegedhel is offline   Reply With Quote
Old 06-25-2019, 09:51 AM   #4
3 Rivet Member

2014 25' FB Flying Cloud
Hillsborough , North Carolina
Join Date: Dec 2015
Posts: 124
Example of Access Panel

Here is a photo of an Access Panel.

I questioned the same thing about was it best to cut an access panel versus lowering the entire belly pan.

I went to Out-of-Doors-Mart near Greensboro, NC and I am very pleased with the work they performed.

They used the "Cut a New Access Hole Method" rather than remove the entire pan.
They also indicated there is a risk of the Black tank coming down when trying to remove the belly pan and chose to cut the new hole.

They also give the hint to raise the valve side of the trailer when performing the valve replacement to prevent any residual fluid trying to drian when performing the work......This is of course common sense, but much more common to those that have done the work before. I had thoughly cleaned and drained the tanks the best I could before taking the trailer to them, but I had not thought about jacking up that side of the trailer. If I had attempted to perform the work on my own, I hope that I would of thought about jacking up the side before removing the valve. But in reality, I would of probably worked from a level trailer, and not thougt about the benefit until too late.
Attached Thumbnails
Click image for larger version

Name:	Black Valve Access Panel v2c.jpg
Views:	27
Size:	224.6 KB
ID:	344463  
GeeSag is offline   Reply With Quote
Old 09-30-2019, 06:52 PM   #5
New Member
2008 27' Classic FB
Hillsdale , New Jersey
Join Date: Dec 2013
Posts: 2
Cut hole?

Hi, I need to cut a hole in my black tank box also. I have a 2008 27ft front bedroom twin classic. I find my valve is stuck open and closed, can’t move handle either way. Could you tell me what they used to cut the hole, and where’s the safest place to do it so as not to screw up my baby? Any help would be great thanks
Louis23 is offline   Reply With Quote
Old 09-30-2019, 07:57 PM   #6
Rivet Master
1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
Join Date: Oct 2010
Posts: 3,117
Blog Entries: 1
Cutting the hole is a little tough. The pan under the tanks is a fairly heavy gauge galvanized steel. And you do not want to drill or cut into the tanks. I used a metal nibbler from Harbor Freight. Maybe $60. I use a stop block to limit how far the drill went in for the initial starts. I cut a small opening under the lines and the valves and then enlarged it when I could see inside. You are not going to use the piece you cut out for anything so it does not have to be cut out all at once. You use a sheet of Al for the cover. One of my friends cut his with a small angle grinder. After you get where you can see in then make the hole the way you need it. No need to work through a hole that is too small.
No problem getting the valves or the rebuild kits from Outdoors Mart Airstreams. The actual valve replacement is easier than the hole cutting. I rebuilt one set and replaced one set. My advise is to just go ahead and replace the valves and the plumbing while in there. I think with new valves and plumbing the cost is about $180 or less. The plastic valve bodies were cracked on the one set. The valves are glued to the plumbing past the valves. Both my trailers are center bath and the plumbing is fitted in pretty tightly.
Be careful to use a stop block to drill the holes to screw the new cover plate on.
Whe I first got my first old trailer I had Airstream do the valves. They charged $500 and just replaced the seals. Gave me the excuse that the valves are glued on. Yeah, but not to the tank, I found out later. Just to the short pipe past the tank. 10 years later I had to replace them. I wish Airstream had done that at the first time.

Bill M. is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Black Water In Gray Water Tank... Rounder44 Plumbing - Systems & Fixtures 6 01-19-2019 10:00 AM
Black tank only for gray and black water??? mmollema Waste Systems, Tanks & Totes 9 02-01-2017 04:36 PM
Overflow from gray water to black water tank? Msmoto Waste Systems, Tanks & Totes 22 12-02-2015 10:41 PM
Replacement black tank and new gray tank mingle51 Waste Systems, Tanks & Totes 3 11-20-2015 07:03 AM
Gray Water Diverted Into Black Water Tank Chaplain Kent Waste Systems, Tanks & Totes 5 06-14-2006 06:38 PM

Featured Campgrounds

Reviews provided by


This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 04:41 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.