David, I'm a DIY homeowner who installed my own system (60'x130' lot) this past spring. 8 zones, 15 rotors, 18 sprays and a drip for the wife's planters. I've got a Watts 1" PVB w/ drain-tee (w/ plugged 3/4" female adapter like yours) below it to drain and blow out. This past week I was able to winterize my system successfully. I'd called around to various local irrigation companies... most were charging $10-15/zone to winterize and turn-up in the spring (w/ guarantee). I hadn't fully decided wh...
