I'd also wager that the thicker pipe is more immune to the pinhole leak
problem from additives that has plagued some areas of the country.

--
Bobby G.

"EXT" wrote in message
anews.com...
Had a short length of pipe in my garage that went from the house to an
outside faucet. Even though I drained it, type "M" pipe split open like
aluminum foil over winter. There couldn't be more than a few drops of
water
in the line but it split three winters in a row. I changed it to type "L"
and had no problems with it since. I am sold on the durability of type
"L".

"Jack" n wrote in message
news
I'm using type L instead of type M copper for re-piping my whole house
where only M is required by code. Mostly it will be installed in the
crawl
space below a wood structure. Am I wasting my money or will it provide
better reliability say 20 to 30 years from now.