At this point I'm still a bit stumped on how to proceed on this project. Hose and hose clamps is about the only thing I'm settled on.
My concern is this turning into a huge project. I want to do this correctly, but do not want to do something where I end up having to replace either the thru-hull fitting or the current Marelon ball valve, or both. I'm afraid, if I try to remove the ball valve, inorder to replace it with bronze, I could potentially loosen the thru-hull such that it needs to be resealed/replaced. I'm looking for a simple safe solution, that avoids that possibility.
If I can, correctly, join a bronze tee to the Marelon ball valve, all my problems are solved. I'll simply attach an additional bronze tee to the first tee, with a bronze nipple. Install bronze or Marelon barb fittings. Install my reinforced tubing, and tighten it all down with my shiny new hose clamps.
My question seems simple. How do I correctly and safely attach a bronze tee to a Marelon ball valve? What material do I choose for the nipple? Bronze? Or is this simply not possible? There does not seem to be a Marelon nipple available.
Surely, I'm not the first person to run into this problem. There's 12,000 other people with the same plumbing arrangement.