Ok,
So I've replaced the tank, along with fill, vent, and supply hoses. I pulled all the wires and control cables out to replace them also. Gutted everything, except the wires to the bow light that I couldn't get to. Basically ending up with all new components, i.e., new hyd. steering, control cables, wiring, bilge pump and float switch, wash-down, etc.
During this, as I removed the livewell and scupper drain hoses for replacement, the thru transom tubes turned and loosened. So I removed them just to check the transom core and reseal. I can't wrap my head around the fact it looks like they just slip through the transom, and a collar just slides down and is held on with a type of ridged fit.
Am I crazy, or is this how they did it?
So, what have you used to replace the thru transom drains? These are all original non-metallic. Not sure about going to a bronze, stainless, or a marelon type, all of which have the nut to secure them. I like the idea of the livewell drain having a valve at the transom also.