hang on a minute.... earlier posts say this plastic piece corroded.... plastic corroding? are we talking about an accumulation of debris or salt build up? or is this a metal tube that is plastic coated and when the coating wears down it corrodes?
i may be dumb as a bag of rocks here, but......

No bag o' rocks ha ha! The hose passes through the transom plate coming into the boat. The nylon insert spreads the hose aginst the edges of the holein the transom plate to secure it. The corrosion is actually the transom plate, which in turn, collapses the hose/insert. It's not between the insert and hose, but between the hose and transom plate..If you pull the connector on the inside of the boat, you should be able to see it right away...

AH HA! gotcha..thanks..