Whatever you decide to do DONT BUY THIS:
http://www.smarthome.com/3106.html
I had several valve failures. They use a little pin type valve, and the gasket seems to give out or the pin gets stuck and they are not repairable.
I could try getting them for you here if you would like. Let me know, this weekend would actually be a good time as I'm always in the hardware store then.I'm having a heck of a time finding the adapters. An online search only yields Watts themselves so I've dropped them an email for a retail source.