i have 2 outdoor frostproof faucets and niether of them work. No noise no water, notta, nothing. they both have the air vent next to the shutoff knob i messed with both of these and no luck. ive made sure theres no shutoffs and yes thay r directly hooked to my water line. i am totally clues less next step is to replace the valve itself. any help would be greatly appreciated.