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Old 09-02-2009, 08:10 AM   #1
1 Rivet Member
1989 25' Excella
Keystone Heights , Florida
Join Date: Aug 2009
Posts: 6
Black water tank/sticky valve

I have a sticky valve in the black water tank Any suggestions on how to correct other than replacing
I have been air streaming for some time but it seems there is always something going wrong. Am I alone or is this just part of RV'ing

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Old 09-02-2009, 08:35 AM   #2
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kennethowens's Avatar
1975 Argosy 24
Malakoff , Texas
Join Date: Apr 2009
Posts: 490
Pull it out...take it apart....clean it.
Buff the contact surfaces with 600-800 grit
sandpaper for smooth slide action. Check
for burrs along the slide path. Your 1989
is 20 years old. It does seem that repairs
are part of the deal.

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Old 09-02-2009, 09:42 AM   #3
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2004 30' Classic Slideout
Fenton , Missouri
Join Date: Mar 2002
Posts: 8,622
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Thetford makes a lube that you might want to try.

Thetford RV Toilet Chemicals - Bowl Cleaner, drain valve lubricant, digester

No promises but I used this on my Hi-Lo that I kept for 14 years. It never got the valve to 100% but it did ease up the operation. Some holding tank chemicals also contain a lube so you might look at that also for future use.

Jack Canavera
AIR #56
'04 Classic 30' S.O.,'03 GMC Savana 2500,'14 Honda CTX 700
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Old 09-03-2009, 10:59 AM   #4
1 Rivet Member
1989 25' Excella
Keystone Heights , Florida
Join Date: Aug 2009
Posts: 6
Thanks to everyone. I will keep working with the suggestions until I find a solution.

Thanks again
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