What is the fullway termination valve

[Lotus 7]

and why should I care?
With the manual in hand, I'm flushing the black water tank and trying to figure out what a "fullway termination valve" is and how it relates to the obvious "black waste tank drain valve." It's in the manual and on the wall of the dump station compartment. Everything seems to work and flush just fine without my knowing where it is. Maybe they forgot to put one in my '17 30T sunstar?

[be happy]

Copied from Google

A fullway termination valve is a gate valve by its proper RV name. So they are saying that the black tank dump valve must be open during the use of the black tank flush system. This is so you do not have sewage blowing out the vent on the top of your RV, breaking the black tank or coming up through the toilet.

Before checking, I thought that's what they were talking about. In other words just make sure your Black Tank Gate value is open.

[Lotus 7]

In another thread, Morich, I think it was, mentioned something about tech writers knowing too much and not being able to understand that some folks don't know as much about the systems as they do. But introducing a 2nd name for the same valve and not catching that as being totally effing confusing would be funny, if it this was SNL or a Laurel and Hardy routine. Kids these days. Getting old sucks.

[youracman]

After I am finished rinsing the black tank in the "normal" manner, I purposely violate that caution note; i.e., I let the rinser spray nozzle run for 2 minutes then pull the "fullway termination valve" to empty the tank and then repeat ..... at least twice. It sure leaves the dump hose in nice clean condition, without a separate hose rinsing operation. 'Course one must never walk off to do something else during that 2 minutes ...... running overtime whilst "multi-tasking" could be a disaster.

Anyway, it works for me. It may well be that a lot of RVers do it that way, dunno.

Thanks for the post, Ted. I am an ME by education and had never, ever heard of a "fullway termnation valve" so now as I approach my 89th B'day I finally know. lol

Stay healthy everyone, good times and safe travels to ya.

[creativepart]

Originally Posted by youracman

After I am finished rinsing the black tank in the "normal" manner, I purposely violate that caution note; i.e., I let the rinser spray nozzle run for 2 minutes then pull the "fullway termination valve" to empty the tank and then repeat ..... at least twice..

Yep. I have a timer set on my watch - I go 5 mins. I set the watch, insure it's counting down and go do other things nearby until my watch alarm goes off. Usually I will intervene at 3+ mins, but I've checked and going 5-min on my large tank will only yield a 2/3rds full reading on the gauge.

If I'm moving to a new camping location I'll do it twice. If I'm putting the RV into storage I do it as many times as needed (~4) to produce 100% clean flow through the clear elbow hose end.

Also - I think the CAUTIONS are written by lawyers and the rest of the manual is written by technical copy writers.