Product Features Part # : 122-CB Thread : 3/8" NPT Male Thread : 1/4" NPT Male Type: Hex Pipe Nipple Material: Brass Product Description IMPORTANT NOTE: "Pipe Thread/NPT Size" DOES NOT directly correspond to Actual Dimensions of the thread (conversion is required). If you have any questions regarding sizing please contact us and we'll be happy to assist in providing measurement assistance.Quantity: 1 (One) piece Our quality barbed/threaded connectors/couplers are manufactured FasParts' highest standards. They are perfect for connecting lines for air, water, fuel, oil and inert gases. Hose ID is the interior diameter of your tubing/hose it is generally marked on the side of most lengths of hoses/tubing. Tubing Hose ID and Barb Hose ID Must Match This precision product works great with other quality FasParts accessories.