OSandY Valve O S Y Valve
OSYSU Installation Call us at (800) 575-9618 for technical assistance or with any backflow related questions! osy gate valve 4 inch 10 inch OSY Valve Replacement!! A brief explanation of the Outside Screw/Stem and Yoke (OS&Y), Fire Department Connection (FDC) and the Post Indicator Valve It is identified as a local control valve. It is used as a shut-off valve on water feed lines to disconnect (control) in-situ zones. for more info, visit ...