just my 2 cents. We have PEX in all the water lines in our boat and I'm a believer. It also seem resistant to the same bacterial smell soft vinyl water lines tend to absorb. I wouldn't hesitate a second to put Pex into any project boat. On our Bavaria they use whale fittings on the pex - I didn't realize they sell those at Home Depot (per Steve's post above). I've been looking to purchase a bunch of spare parts to keep on-board so I can attend to any future issues when they arise.