Wet_Boots: This is a 3/4" model though. Mine are 3/4" too and close after about 5-10 seconds.
wsommariva: When I installed my system, I left room for myself to work inside the box if needed to (ex. 3 valves per box). I cleaned them inside the box/still attached to the manifold. All you do is take the top 4 screws off carefully, and don't let the "solenoid plunger" fall out of the top bottom.