The drain plumbing is very similar to that used in your home. The system is trapped and vented to prevent waste gases from backing up into the campervan. The drain plumbing is made of PVC, is durable, and resistant to most chemicals. All drain plumbing terminates in the “grey water” holding tank.
DRAINING THE HOLDING TANK
The valves are called knife valves. A blade closes the opening in the sewer drainpipes. The blade is connected to a T-handle. To empty pull the T-handle. Empty into approved dump stations. For a full directory of private, public, RV park, non-park, municipal, truck stop, rest stop, campground, camping, resort, commercial, pay, donation, and free dump stations go to www.sanidumps.com