why have a micro switch ? i dont know why anyone would not use a varistream or flowmaster, that means the pump is only on off full power, which cant be good for the pump, you have no control over your water, and i you just have a valve on the end of your hose, when its off the pump is going to be thrashing out for nothing. The pressure switches wear out too easy, varistreams can last years and years... and then you have decent control over your flow, and it saves power and water when youve got the valve closed