Enzotech high quality nickel plated high flow fitting is compatible with 1/2" ID tubing and G1/4" thread type. Also included is an integrated o-ring for perfect sealing. Outer barb is 1/2" with 10mm hole diameter. Tubeing ID 1/2" Tubeing OD:   Thread Type G1/4 " Finish: Nickel Plate (Metallic Silver)