my 2010 3455 sewer boom was too short to hold a 15 rhino. I bought a larger tube- about 64 " - from camping world and finally cut it down and quit using the Rhino because their fitting wouldn't fit thru boom. I got a different hose, cut the boom down and also cut half of the rubber tubing off which allows the boom to freely move in all directions.
My current tube is about a foot longer than the original but now actually works !
I don't see how the original worked at all.
I also now have a sewer box with a 15 rhino , a 5 foot rhino and an additional 10 foot blue hose to match the one in the tube.
My biggest mistake was starting out with a 15 ' Rhino.
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