Hello Jim,
On our 77 Sovereign's black tank valve quit holding water about a week
ago and I've been doing a lot of "stinky" research in this area. Like
what kinds of maintenance do the valves need to make them last as long
as Thetford say's they should? I crawled down under mine here the other
day and started the real nasty job of replacing both valves and was
real fortunate to find that the last person to go this way had not put
any insulation around the valves to make the job worse than it already
was. (wet, gooey, @#$%infested insulation, you get the general idea).
Anyway to make a long story short, This whole ordeal has made me very
interested to know how a person takes extremely good care of them as to
make them LAST!!.... So I know this email doesn't help you much but I
am interested to see what you find out... I know that when you use a
"Valve lubricant" such as "Aqua-Kem" brand, you need to use it with a
compatible digester/waste deodorant in order for things to work
properly. Read the bottle or bottles to make sure they work together.
Jeff