Old-Biscuit wrote:
I have three tanks...black, grey and galley
Black and grey are good size ----galley is 28 gal
All three drain into a common drain header so I permanently installed another drain valve in that common header.
With it closed I can open grey/galley drain valves and increase my grey waste capacity.
I can open all three tank drains valves ----black, grey & galley and really increase my waste water capacity
And after dumping black tank I can close the 'extra' valve.then open grey/galley and backflush soapy grey into black tank then dump
Plus with the extra valve I get no surprises when I remove drain line end cap unless extra valve is leaking.
Did the permanent install because I didn't want the extra weight of the twist on valve hanging on end of drain pipe while traveling OR having to install/remove/store when I want to use it.
VERY good advice. I may have to see about doing that. I have 3 tanks as well- with 3 valves.