Dutch 12078 has it right! I do the same thing for the back-flush process. I use a "Flush King" style. Same as the OP referenced, except it has a clear section you can see through.
About a "simple" 10 minute replacement if the camper valve goes bad??? That's not true for every camper. I'm on my 3rd camper and each camper has had the slide valve hard plumbed into the black PVC lines. The only way to get them out is the cut the black PVC drain pipe and replace, there's no flexibility as both tanks flow to the same point. In my current camper, it would be even more difficult (much longer than 10 minutes), as I'd have to remove the under cover first. That in itself would probably take MUCH longer than a simple 10 minutes.
About a "simple" 10 minute replacement if the camper valve goes bad??? That's not true for every camper. I'm on my 3rd camper and each camper has had the slide valve hard plumbed into the black PVC lines. The only way to get them out is the cut the black PVC drain pipe and replace, there's no flexibility as both tanks flow to the same point. In my current camper, it would be even more difficult (much longer than 10 minutes), as I'd have to remove the under cover first. That in itself would probably take MUCH longer than a simple 10 minutes.
I have the Valterra twist-on valve semi-permanently installed on the waste outlet. When dumping, I open the third valve and the black tank valves first, then close the third valve and open the grey tank valve to back flush the black tank with grey water before draining everything. The third valve also makes it easy to gain extra grey tank capacity by letting it equalize with the black tank if necessary.
I sometimes put grey water into my black tank when boondocking. They are on the same level and the two valves are close together but that leaves about a quart of stuff between the valves. By using a $6 end cap with a hose bib and a $5 hose valve I can drain the quart of stuff into the sewer hose before taking the end cap off.
Dennis, if your valves are like mine it's nearly impossible to get the old valve out as everything is that ridged. I had to cut a 1/2" section out of the smaller grey pipe and put it back together with a rubber hose.
Sometimes a hose goes on it instead.:W
Dennis, if your valves are like mine it's nearly impossible to get the old valve out as everything is that ridged. I had to cut a 1/2" section out of the smaller grey pipe and put it back together with a rubber hose.
Sometimes a hose goes on it instead.:W
