thanks 2 biz, I have had system for some time, when we first got it we really were not sure if it was working correctly, and even then it was extremely had to get any help from these folks. here in Denver I found a person that was more familiar with the system and looked at it . he found or so he says, one wire installed incorrectly on each bay, he also said that the air for the blow out and pump had to be around 100 psi (pump air about 5 psi higher to prevent pump from staling) not the 30 and 35 psi I was originally told. he said the biggest problem that he found is finding the sweet spot. my system has three inputs for each bay, high pressure gun, brush , foam gun. right know we are just trying to get the brush and foam gun working on system. he said that he has never gotten system to work on high pressure gun. my thoughts on system it seems that the system would work better if it did a air only blow out on each portion and at higher volume maybe for 30 to 60 seconds then do the two blow outs with rv anti freeze or washer fluid. another question ? my lines from unit to roof connections are 3/8 poly tubing for foam brush and foam gun. but the ones that I had installed for hp gun are only 1/4 tubing . problem ?