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Sight unseen, i would recommend Irritrol 2500F valves, Physically strong, and eternally repairable.
Big Thanks and follow-up....so flow is coming thru, and I have erratic performance. allow me to explain:You could have messed up the common wire while replacing those valves
That's an old watts 709 back flow assembly
The gate valves could have broken or you didn't turn them on all the way?
turn them both down until it's taught- then all the way back up- lefty loosey righty tighty- should be at least 5 or 6 revolutions both ways.
You can open up the test ports ( Try all 4) to ensure you have water flowing through the device if you have a small stubby screw driver and a strong hand.