I also used 3/4" pvc on one I made, I put a 45 on the ends with a 8" piece of pvc also 1/8" holes in that for a little bit more side shot. I used 2-3/4" lines into the spray bar. Worked pretty good. Still took out my express and put in an automatic and have not looked back!! best 1 1/2 years I've owned place!!! washing more cars less headache's.