OK, sorry to bug you guys further with this condensate drain dilemma.
I have decided that teeing into the shower sump drain line would be the easiest and least costly method to eliminate the aft air handler / evaporator from draining into the bilge. Here is the problem, I need a tee fitting that will allow me to connect the 5/8" drain hose from the evaporator unit into a 1" shower sump drain hose. I can't locate anything even close in stainless, brass, or nylon. Would it be acceptable for marine applications to construct this reducing tee from PVC. Parts are readily available to construct a glued up tee using 1" spigot x 1" hose barb and 1" spigot x 5/8" hose barb?
Or, is there another way do accomplish this in a better manner?