I am installing a sprinkler system and i have a copper main line running to the house from the meter. I am trying to tie pvc off of the main copper line. What is the best way to do this? And second question...I usually use 3/4 inch pipe to run off the main line for the sprinklers. Can I use 1/2 inch...and how many heads will it pop up with this water pressure? All advise appreciated!!