The Master valve wires up in the clock one wire to the MV connection the other goes to the common either in the clock or in the common connection in the yard ,replace it with a HPV (high pressure valve ,hunter brand ) this will do it.
Nestor's Sprinklers
Duluth,Ga.
Vincent Nestor
Nestor's Sprinklers & Lighting
Alpharetta,Ga.30022
vpn1@bellsouth.net
www.NestorsLandScape.com
www.GeorgiaLighting.net