Dont see a brand stamp but it has a round solonoid, has 8 screws in the top, green, prob 25-30 yrs old. It is staying on even with system off. Took the top in to the local dealer, bought a new diaphragm (which didnt look like the old one), replaced it in its correct orientation. Tested it, did fine shut off. Buried everything-..doesnt work. Dug up, all connections seem fine, I tried to get the solenoid to click by removing and touching the wires to the control box and to the transformer directly...
