The Zurn 3-F210R Fire Riser Check is a zone water check to prevent system reversal of flow; as required by systems including sprinkler standpipe systems and fire department connections. The F210R Fire Riser Check includes tapped and plugged drilled holes for use with optional Check Trim Kit (sold separately) to complete Riser Check. Check Trim Kit includes two gauges, two isolation valves, fittings and drain valve.