Image Adjustable Pressure Restricting Device Jump to Section Product Options Related Products Product Options Part Number Female Thread Size Male Thread Male Thread Size Female Thread Material APRD150F 1-1/2" NST (NH) 1-1/2" NST (NH) Cast Brass APRD250F 2-1/2" NST (NH) 2-1/2" NST (NH) Cast Brass Related Products Image Single Clapper Siamese Connection Back Outlet