TruFLOW Manifold Supply and Return Ball Valves are full-flow 1-1/4 ball valves with R32 male by R32 union nut that fits directly on the TruFLOW Manifold. The Supply Ball Valve comes standard with a thermometer for easy visual check of supply temperatures and a built-in filter ball. The filter ball has isolation within the valve to speed cleaning of the filter. The Return Ball Valve comes with a thermometer for easy visual check of return temperatures. Use only with the Wirsbo TruFLOW Manifolds.