does not have a Grey tank. I never really needed one for mine. Be sure you have the hose connection on and open or the dump valve open when you use the water.....or you will end up with a shower, and more, full of water back up. Send me an email PM contact and I will send a manual with the other info.
"If it can't be reduced, reused, repaired, rebuilt, refurbished, refinished, resold, recycled or composted
then it should be restricted, redesigned or removed from production."