Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×

Thread Tools Search this Thread Display Modes
Old 07-08-2007, 12:44 PM   #1
New Member
1992 34' Excella
Chippewa Falls , Wisconsin
Join Date: Dec 2006
Posts: 4
Blackwater drain valve problem

Hi All!

I have a 98 Classic Limited 34', and something appears to be hindering the operation of my black water dump valve. It doesnt seem to close all the way, is difficult to move, and it is difficult to secure the dump valve handle retaining clips. When I remove the bayonette connection cap, the drain pipe is full of blackwater debris. I have used lubricant, and worked the valve repeatedly, and had limited success, but within a week or so, the valve seems to still let waste by, only to be stopped by the "cap". Can anyone give me hints on an agent that will dissolve whatever is keeping this valve from getting hung up, or am I looking at a valve replacement?
Fred Schmidt
aluminator34 is offline   Reply With Quote
Old 07-08-2007, 03:18 PM   #2
Site Team
azflycaster's Avatar

2002 25' Safari
Dewey , Arizona
Join Date: Mar 2005
Posts: 15,549
Images: 62
Blog Entries: 1
Are you missing a toothbrush?

You may have gotten TP (butt wipes) jamed into the valve. Getting it cleaned out could be a chore. I have no idea where your valve is in relation to the drain, but you will need to try and remove the blockage at that point.


Wally Byam Airstream Club 7513
azflycaster is online now   Reply With Quote
Old 07-08-2007, 03:35 PM   #3
moosetags's Avatar

2015 25' FB Flying Cloud
2012 23' FB Flying Cloud
2005 25' Safari
Santa Rosa Beach , Florida
Join Date: Jul 2006
Posts: 13,142
Images: 5
I would first try repeated clean water flushes of the black tank using a Flush King or similar device. I would let it fill up to about full and then let it rip. Hopefully, this would flush out any obstructions near the valve. You might also try the ice thing. With the trailer hooked to the TV, with just a gallon or two of clean water in the black tank, put a couple of bags of ice down the toilet (without the plastic bag, of course). Immediately go for a ride making some quick accelerations and fairly short stops, causing the ice to "scrub" the tank before it melts. Come home and do several more complete flushes of the black tank. If an obstruction is the problem, this should take care of it. If it is in fact a faulty valve that needs replacing, you will have a really clean black tank to work with.
SuEllyn & Brian McCabe
WBCCI #3628 -- AIR #14872 -- TAC #FL-7
2015 FC 25' FB (Lucy) with ProPride
2020 Silverado 2500 (Vivian)
2023 Rivian R1T (Opal)
moosetags is offline   Reply With Quote
Old 07-08-2007, 06:53 PM   #4
3 Rivet Member
cammur's Avatar
2005 25' Safari
Roseville , California
Join Date: Jul 2005
Posts: 237
I don't know what lubricant you used, but a spray silicone works much better than something like WE-40.
2005 25' Safari SS
2005 Dodge Ram 2500 Turbodiesel
WBCCI #3580 - Region 12 NorCal
AIR #8752
Roseville, CA
cammur is offline   Reply With Quote
Old 07-09-2007, 12:22 PM   #5
Rivet Master
Join Date: Dec 2002
Posts: 1,335
Images: 4
On my trailer this exact fault was caused by a build-up of calcium scale, as described here:

A 10% hydrochloric acid solution might clear it, if left for a few days.
Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
nickcrowhurst 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
Globetrotter 1963 - Kitchen Sink Drain Leak Under the Floor Uncle_Phil Plumbing - Systems & Fixtures 3 08-09-2002 07:59 PM
Air conditioner drain jcanavera Furnaces, Heaters, Fireplaces & Air Conditioning 3 07-10-2002 02:52 AM
Armstrong drain lines davidz71 Furnaces, Heaters, Fireplaces & Air Conditioning 4 07-03-2002 10:01 AM
White water tank drain ramoore53 Fresh Water Systems 4 05-01-2002 11:08 AM
OPD valve w/sight gauges 83Excella LP Gas, Piping, Tanks & Regulators 1 04-16-2002 08:21 AM

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.

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

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.