that valve uses 12 v which addes to the weight quiet a bit because of batteries. I will try and modify a suction cup and pipe to make this valve myself. I am sorry I have 1 last question. I dont know too much about power and circuits, if I had a 12 v DC motor that was externally powered how could I hook it up to the arduino to control when to turn it off or on? I obviously cant use the arduino for power like the small 3 v dc motors so how do you control loads with arduino that require a lot of voltage? I know how to do it with servos because all I need for servos is hook the digital pin into arduino digital pin but for DC motors and similar loads that only have 2 wires and such high voltage requirement how do you control them with arduino?
PS: I just finished making an easy check valve with a new design so that is solved.