I have Irritrol 2400T valves and one that is stuck open. I've shut off the water supply, replaced the solenoid, and unscrewed the small black ring that the Solenoid screws into on top of the valve, but no luck. I do not see any screws or other hardware that would allow me to take the top of the valve off to check the diaphram. Am I missing something... or do I have to replace the whole valve? Also, If I have to replace the valve, is there a better model of valve to go with that is more serviceab...
