Thread Tools Search this Thread Display Modes
Old 02-06-2017, 07:20 PM   #15
Rivet Master
1972 27' Overlander
Denver , North Carolina
Join Date: Aug 2004
Posts: 756
Images: 4
I just finished a 72 Overlander that year does not have a grey tank as others have said. The smaller hole is the black tank vent. And the grey water did not flow into the black tank. It is usually a separate 2 3/4 " sanitary pipe that Siameses after the black tank valve. Mixing black and grey is bad business for a variety of reasons not the least of which is the possibility of allowing gasses back into your trailer, you could also wind up with a heck of a mess should the black tank backup into your grey system. What you can consider is using your old fresh tank as a grey tank ( take a look inside you won't want your fresh water stored in that ). All tanks need a to be vented. On thing you might take a look at is a device called a Hepvco valve, this will replace the P trap under your tub the goes through the floor. Another idea I see above is the Natures head composting system, if you don't want to mess with a black tank these are a good option as are cassette or porta potties. Also, you'll probably need to replace the tank and the galvanized box it comes in - keep the foam angles thing cause I was not able to find a replacement for it and that is what provides the angle to make your tank Drain properly. In closing - if you need help, PM me , I'll be happy to help.


Lucky Dave, Denver NC
mccrosti is offline   Reply With Quote
Old 11-09-2017, 04:24 PM   #16
Rivet Master
nickclifford's Avatar
1972 31' Sovereign
Currently Looking...
felton , California
Join Date: Aug 2014
Posts: 601
Images: 1
black to grey, divert valve ?

just about to have my black converted to grey & install a composting toilet but wish to use a divert valve so if next owner wants to go back to a flushing toilet, no issues.
is this possible? an easy valve to send shower & sink wash water into Black tank ? My Landyacht has a 21 black gallon tank ... so I guess enough for a few quick showers for weekend camping.


nickclifford is offline   Reply With Quote

black tank, conversion, gray tank, gray water tank, help wanted

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 tank only for gray and black water??? mmollema Waste Systems, Tanks & Totes 9 02-01-2017 05:36 PM
Black tank to gray tank conversion. Is it possible? Blu_Hwy_Lady Plumbing - Systems & Fixtures 11 03-11-2016 12:05 PM
Replacement black tank and new gray tank mingle51 Waste Systems, Tanks & Totes 3 11-20-2015 08:03 AM
Tank level monitor suggestions for new black/gray tank mrsfixit Waste Systems, Tanks & Totes 5 06-28-2012 07:39 PM
Anybody know if a black tank will fit in the gray tank space on my TT? Aage Waste Systems, Tanks & Totes 9 02-24-2010 05:13 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 09:07 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.