Low Cost Motorized Valve I'm looking for a low cost motorized water valve.  I've done a number of searches and have found nothing compelling.  Has anyone here used a motorized water valve with Arduino?  What would you recommend?

A fail-open solenoid might also work but I'd like to try my hand at a motorized valve.

The valves I found start at US$50.  I'm looking for something cheaper.  The purpose is tinkering and I'd like to make an "if water detected - then close valve" sketch.  Ir's simple, just more expensive than I expected.
You can get sprinkler valves, that use solenoids, for under $20 that fit on plastic PVC pipe and are designed for water, such as these at SprinklerWarehouse.  They typically use pipe sizes of about 1 inch.