I recently devised a set of plans for a D.I.Y. cloner. I made a trip to the local plumbing supply store to purchase the 1/2" PVC and the neccessary fittings, and I got the "What type of PVC rating do you want ?", and I was lost. Not knowing the different ratings I said I don't know, and he then asked what it's being used for, caught by surprise, I said a drinking fountain! So, if any one would like to enlighten me as to what rating of PVC I should use for my cloner, please by all means, teach away !!!