[RGordon]

Another suggestion you might want to look at, I installed a 3" manual valve right at the end cap where you connect your hose. I got tired of the surprises and not knowing whether or not the valves was holding. One of the best additions I have made. Another modification that I made was to install conduit unistrut hangers to hold the 3" pipe steady. The only flimsly strap allows the sewer piping to move back and forth on rough highways, breaking pipe fittings up inside the plastic compartment under the bottom. It also caused the pipe clamps to work loose where they connect to the grey water tank. The stationary pipe hanger stopped all the movement. I got tired of constantly making piping repairs and looking for a hardware stores.