Brass Craft OCR14 R1 1/2 Nom. by 3/8 O.D. Brass Craft OCR14 R1 Straight Stop, Rough Brass Stop type: compression inlet Inlet: 1/2-Inch nominal copper (straight) Outlet Size: 3/8-Inch OD (1/4-Inch nominal) Rough/Unplated finish Machined one-piece brass body provides strength, durability and long-lasting performance