We have a riser room at the rear of a building. An exterior door opens to interior of riser room which contains a backflow preventer with two indicating control valves, a rise check valve, and a water flow switch. Underground line to building has a nonindicating gate valve in roadway box some distance from door to riser room. AJH says a post indicator valve must be installed outside riser room. We believe the current arrangement of piping and valves meets the standard without the PIV
Please comment.
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