Keep your sewer discharge hose from sagging and eventually breaking. The weak point is right after it exits the sewer waste valve when you are emptying your holding tanks. There is always a short span before it reaches your RV sewer hose ramp support. A SHORT THREE FOOT SECTION OF PLACTIC PVC GUTTER WORKS GREAT! Just strap it on with a couple of bungee balls. Remember, black water holding tank gets dumped FIRST. Then grey tanks to rinse the nasty out of the hose.