Ted I replaced all the water lines in my '73 Ambassador with 1'2" PEX. Also R2 the water heater with a Atwood, 3/4" fittings on it. As for using the 1/2" water lines I to was concerned about the water pressure, but gave in to price. Yes the 3/8 line cost more here to so went with 1/2" everywhere and am real pleased. I haven't noticed any difference in the water pressure at all. Pleased with PEX! Bobby
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