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The Retrofit Kit is compatible with the 3/4" Model 20XLDULU Pressure Reducing Valve (PRV). Retrofit Kit components include one brass adapter fitting, o-ring and union gasket(s). The retrofit kit allows you to replace an existing Model NR3XL/DU, NR3/DU or BR4/DU PRV with a 3/4" Model 20XL PRV without need for re-piping serving as a drop-in replacement.