In a message dated 7/6/01 6:37:15 AM Eastern Daylight Time, fastenuf4me@hotmail.com writes: << 1. Replace the lines with the same hose/tubing arrangement. >> Hi Charlie, I wouldn't use the PVC or any plastic hose in this arrangement. Thats your engine's coolant you are fooling with. I have no scientific facts to back me up. I just wouldn't do it. I like plastic but not in this case. This installation has too much vibration and heat for me and it's a critical system. The original setup lasted 20+ years, why not just replace it? The other alternative is to replace it with the cheap heater hose. Cars run this stuff for decades. Squeeze it each year and replace it when it gets too soft or too hard or every 5 or 10 years which ever is sooner. I like the idea of the shutoffs. I'll put that on my wish list. Al Johnson 34' Marine Trader "Angelina"