Thread Tools Search this Thread Display Modes
Old 04-04-2011, 11:42 AM   #1
2 Rivet Member
1967 22' Safari
1978 25' Tradewind
NEW LENOX , Illinois
Join Date: Nov 2007
Posts: 83
Adding a larger grey tank to a 78 Tradewind

I have a 1978 25 ft. TradeWind with the infamously small grey tank (like 12 gal. - rediculous!). I have recently dropped the belly pans because I had a split brake line that needed repair,,, and now I have removed the side wraps so I can wire brush and POR15 the frame as long as I am there..... And, since I am there, how about installing a bigger grey tank????? Madness.... just madness....

So, what's the easiest approach to adding more grey tank capacity?

I can add a second tank closer to the axles, but there are some drain pipe height issues to work out and, the existing grey tank will have to be replaced since I can't cut into it and I can't merge into it's discharge line.

Oh yeah, I also want to install a macerator semi-permanently.... there is just enough room for it, I think....

Does anyone out there have the drain pipe plumbing diagram from the service manual for a mid-to-late 80's, or 90's, 25 ft. TradeWind with the rear Shower Bath configuration? I am looking for ideas....

And, do I really need the foam pad under the tank? I am not winter camping (not using water when I do) and I will support the tanks independent of the bottom cover.


John H
Attached Files
File Type: pdf 78 TW Shower Bath plumbing.pdf (41.4 KB, 78 views)
File Type: pdf 78 TW Shower Bath tanks.pdf (48.6 KB, 64 views)

johnhh is offline   Reply With Quote
Old 04-04-2011, 12:37 PM   #2
Site Team
Aage's Avatar
1974 31' Sovereign
Ottawa , ON
Join Date: May 2008
Posts: 11,169
Images: 25
Wow, you have a 12 gallon grey tank? That's luxury to me; ours is ten gallons!

It's my belief that you will need top access to change the tanks fabout, or just add a second grey tank because of the way the tanks are suspended on the frame rails. By that I mean remove lots of interior (oh NOO!)

But check with an expert: Member Colin H will know...

If it's to be, it's up to me.
Aage is offline   Reply With Quote
Old 04-04-2011, 12:42 PM   #3
2 Rivet Member
1967 22' Safari
1978 25' Tradewind
NEW LENOX , Illinois
Join Date: Nov 2007
Posts: 83
I was being generous at 12 gal., you are probably right at 10 gallon. It's a damn small tank...

Top access is not what I want to hear. but no, no, no. The bottom is off, I don't want to be tearing out the inside...

John H
johnhh is offline   Reply With Quote
Old 04-04-2011, 12:43 PM   #4
3 Rivet Member
heslinhotel's Avatar
1989 29' Excella
1974 Argosy 26
Youngsville , North Carolina
Join Date: Sep 2006
Posts: 149
John H,
I think you want to keep the foam pad. It will keep tank from shifting and chaffing, which will eventually lead to tank failure.
heslinhotel 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
Add additional grey tank Breadbug Waste Systems, Tanks & Totes 4 04-05-2011 06:20 PM
Grey Water Tank Flushes Toilet (to conserve fresh water) LittleRadio Sinks, Showers & Toilets 8 03-28-2011 10:10 AM
Pex for fresh tank outlet DanielB Fresh Water Systems 12 01-23-2011 04:10 PM
replacing black water tank in 68 Tradewind clydecrashcu Waste Systems, Tanks & Totes 1 01-17-2011 09:28 PM
Extra 67 tradewind blackwater tank, gray water tank poezlaw Waste Systems, Tanks & Totes 0 01-17-2011 09:19 PM

Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:33 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.

Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.