I replaced all of the coolant hoses on my M25, in a Catalina 36, last year, except two - the 7/8" ID right angle run from the thermostat housing to the exhaust manifold, and the small one from the water flange to the water pump. These are reference numbers 19 and 8, respectively, in the parts book page "water flange" (see link). Problems 1. The "marine flex" wire-reinforced 7/8" hose I tried to use for "19" won't make the turn without collapsing. I think it's intended to be exhaust hose, not coolant hose. I don't think wire reinforcement is necessary for this. Comments? 2. The little hose - "8" - just coudn't find the same material. I am planning on trying a molded automotive coolant hose that turns 90 degrees, but I couldn't get an appropriate one in 7/8" ID; I did get one that's 13/16" ID - I think it will fit. Has anyone else solved this problem? Please help! Thanks, jv http://www.marinedieseldirect.com/universal/200142/water-flange-group.htm