Save now and get a deal on the Hydro-Rain HRV-100-SS-FC 1" Slip Reverse Flow Valve with Flow Control with the pros at PlumbersStock. The Hydro-Rain HRV-100-SS-FC is a 1-inch Electric Irrigation Valve with Slip Connections and the ability to adjust the rate of water flow. The HRV Series Automatic Valves with flow control handle are built with heavy-duty PVC construction, featuring abilities for both automatic and for manual operation. while a stainless steel metering pin ensures optimal diaphragm performance. The HRV100SSFC is a 1-inch Automatic Valve rated for higher pressure lines (up to 150 psi). For use with any sprinkler system designs, Hydro-Rain has made a name for itself by manufacturing reliable plumbing fixtures.