Park the RV in a flat area, set the parking brake and disconnect any water connections. Consult your RV user's manual for the location of the housing for the tank you wish to install. Open the housing, typically found on the rear left side of the rig.
Pull out the hose attachments from the housing and attach them to the tank. For freshwater holding tanks, attach the hoses running from the hot water heater and cold water attachments at sinks. Before attaching to the tank's nozzle, slide two hose clamps around the hose. Once the hose and attachments are on the tank, slide the hose clamps over the nozzle neck and tighten them down with the screwdriver.
Push the tank into the housing and screw down any mounting or holding brackets. Check the connections at the sinks or other water faucets.
Follow the hoses to the back of the toilet if attaching a black water tank, or to sinks if it is a gray water tank. Caulk the seals around the nozzles for black or gray water tanks.
Close the housings and reconnect the water source to the RV. Fill the freshwater tank--if that was what you installed--or flush the toilet to check that the water drains into the newly installed black water tank.
