.... Only problem is I can fit either the new tubing or the whale gusher hose in the bypass under the floorboard but not both. I wondered whether I could cut another grove opposite the one for the whale gusher without impacting the keel structure.
Since the new hose is on the discharge of the pump, it doesn't need to be as rigid as one on the suction side like the long one to the whale gusher. Try some of the cheaper white plastic bilge hose with the accordion style ridges. You could use fish tape and get it under the water tank through the forward port scupper. If needed, use a rasp or long drill to open up the scupper. There was also a little play on the Rhapsody water tank that allowed it to move enough to help fish the hose underneath it.
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My late model hull (481) has an 90 degree elbow with a screw fitting for the drain just under the main cabin sink. So the dishwasher fitting did not fit. On top of that I could not release the flexible hose from the elbow and was afraid I might sink the boat if I cut it, there being no valve on this through hull. Head sink is metal and also has an elbow just below the drain. I'm thinking I could somehow still use the dishwasher fitting under the main sink beyond the elbow
Use a pipe wrench on the hose at the sink end to see if you can break it loose. If you need to cut the hose, the through hull should be above the waterline if you force the boat to list to stbd. I've done that by taking a halyard to a dock cleat on the stbd side.
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