Waste Valve Replacement

My standard suggestion is to look at where the valves are on the tank. Then if possible tilt the trailer so the valves are the lowest point and drain the tanks. Then tilt the trailer in the opposite direction to make any leftovers flow away from the valves.

If the valves face each other (mine do) then tilt the trailer to keep the black tank from dripping on you.

I didn't lube my seals when I had to replace the valves. But if I did I would probably get some silicone grease from Home Depot. link

My black water dump valve is the type with the cable. Mine was an absolute terror to replace. I could not get enough separation between the pipes in order to get the valve installed smoothly. I ended up using one of the bolts and a nut to separate them enough to get the valve in position. I also had to put the seals on opposite than what the instructions called for (can't remember if the instructions called for on the valve or on the pipe) in order to have enough clearance to get the valve in place without disturbing the seals. After my third try I got it installed. Had to cut a hole in the underbelly as well to get to the valve and lace it up with wire ties. I say all this hoping that yours is on the end of the drain and not under the belly like mine otherwise consider this a heads up. Two people may be able to do the job smoothly.

Andym133 has a good point if you're still camping alot for the season. At any rate, if you're going to replace both- make sure you've thouroughly flushed both tanks and fully dumped before you start. Have gloves and a bucket ready, and some good disposable rags. one of the best tools is a small 4 or 5" crescent that opens to 7/16", or a very small ratchet with that same sized socket. If you want to lube the seals before you install the valves- get a small dab of white lithium grease and wipe it around the seal on both sides...avoid opening the gate valves because those seals will want to come out. This isn't a bad job at all and should take less than an hour.

Happy Camping.

Just buy a add on cutoff valve for now until you won't need the camper for a awhile to do the repairs.

Go to your local RV parts place and get the kit to rebuild the valve, yes it happens frequently