Let me suggest that you don't really want a long sewer hose. Because of the corrugations, the water doesn't flow fast in the hose, solids settle out and get stuck, the thing is a bear (a clumsy NASTY bear) to clean when you are done, it NEVER dries out, and it is nasty to store. Besides that, when you pull the dump valve for the black water, the whole 30' will jump, and pull out of sewer, making a mess on your lawn.
Instead, go to the plumbing dept at Home Depot (etc) and find Schedule 40 PVC drain pipe and fittings. That's the thick-walled slick white stuff. Buy three 10' lengths of 4" pipe, three 4" unions, and two 4" elbows - and a small can of PVC pipe cement. All cheap.
When you get it home, use a hacksaw or a carpenter's saw to cut a 3" piece and a 6" piece off the end of any one of the pieces of pipe. Then -
1. On pipe number 1, glue a union on one end. Glue an elbow on the other end. Glue the 3" piece into the elbow. Glue another union on the 3" piece. Set pipe number 1 aside.
2. On pipe number 2, glue a union on one end. Set pipe number 2 aside.
3. On pipe number 3, glue an elbow on one end. Glue the 6" piece into the elbow.
You are done. You now have three pieces of pipe which can be fit together into a 30' piece, and then disassembled into three 10' pieces. "Water" flows rapidly through them, nothing sticks, they are easy to clean (after disassembly, just shoot the stream of a hose into each one), and easy to store (I just lay them on the garage floor under the TM.)
Piece number 1 has a funnel on the end - the union that sticks up from the elbow. You put this funnel near the trailer's dump valve, and stick your normal sewer hose into it. (Even better, put a standard sewer hose twist fitting on a very short length of sewer hose, maybe 2', just for this purpose.)
Piece number 2 is just an extension - you push the plain end into the union on piece number 1, and pull it back out again when you are done dumping.
On piece number three, the plain end is pushed into the union on piece number 2, and at the other end, the 6" pipe sticks down into the sewer cleanout, and won't jump out.
This makes more sense with a diagram.
Bill
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