You can make it yourself actually.
You need solenoid valve and a proximity sensor.
just do abit of piping work... and you are done.
YOu can still use your current tap. No need to buy entire Sensor
Tap which easily reach $150.
Solenoid Valve is about $25, Proximity Sensor about $40-50. Adapter
rings, etc another $10.
totall .. $90 there.
