You can Install a I-20 Hunter with a Backflow and a shut off on top of head ,also you reduce the flow with the Key.
Nestor's....
www.NestorsLandscape.com
www.nightlighting.net
vincent nestor
Vincent Nestor
Nestor's Sprinklers & Lighting
Alpharetta,Ga.30022
vpn1@bellsouth.net
www.NestorsLandScape.com
www.GeorgiaLighting.net