Pneumatics
Fright props 120 volt 1/2" solenoid =$60
Craftsman 5 gal air tank=$30.00
Misc. fittings=$10 (1/2" floor trap was bought at homedepot)
I didn't use 1/2" brass nipples because it reduces the inside dia. too much.
By using a rubber hose this give me many mounting options.