See all products of FlowCal™ (compact) FlowCal™ sweat, Compact automatic recirculation balancing valves. FlowCal™ PEX, Compact automatic recirculation balancing valves. FlowCal™ NPT, Compact automatic recirculation balancing valves. FlowCal™ press, Compact automatic recirculation balancing valves. FlowCal™ body, Compact automatic recirculation balancing valves.