Well the adventure of not paying rent has its draw backs. I'm going to need to replace the 1960 steel galvanized pipes under my house, they are starting to leak. The life span of galvanized steel is 30 to 50 years, so it's about due. Based on the title of the post I doubt that there is much left to the imagination as to what I could possibly be wanting to use for new water pipe. The plastic stuff is dirt cheap and I heard that the government was encouraging people to use the plastic BS back around 1991 when the EPA figured out that copper is bad for you. You know what that usually means. Copper is probably good for you, and the plastic is likey at the best not bad for you at the worse not good for you. Probably something in it to help kill us off before we reach social security age. Reasons I don't like plastic water pipe: The polybutylene recall, so I have trust issues with plastic. Bacteria loves to grow on plastic. The government encouraged people to buy plastic in the early 90s. Where I live the utility water pressure sits at about 100psi. Reasons I like copper: It's worked for 100 years and really took off in the late 40s. Bacteria don't like copper or copper patenia. In liquor distillation copper takes out some of the impurities. Copper stands up to pressure well. Once you decided you want copper then you must choose type M or type L. The difference aside from price as far as I can tell is that type M is general low pressure use under 100psi. Type L is for higher pressure and corrosive hard water. I have very hard water and 100psi of utility pressure so type L for me. If you have less water pressure or is not hard water then type M will work fine for you. The difference? L substantially heavier than M and the price is between L is its 50% to 100% more than M.