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These check valves are pre-assembled and 100 percent tested to provide durable drip tight operation. The product is available in 12 OD sizes between 3/8 and 2 inches for applications up to 200F and 230 psi. The CV14FR and CV15FR come combined with a pressure compensating flow regulator (0.5 to 4 gpm). All units are certified to ANSI/NSF 61.