Thanks mheaven. Can you use brass solenoids?
Thanks for the help, that's what I'll look for.Would not recommend using brass, brass corrodes very easily. If possible I would recommend using a solenoid with stainless steel parts or a mixture of plastic and stainless steel.
You will also want to find one with a built strainer, it will help keep small particles getting into the moving parts. The last thing you want is for the solenoid to get stuck.