Enzotech G1/4" to 1/2" ID, 3/4" OD Compression Fitting for Soft Tubing, 90&deg; Rotary, Chrome 90 Degree Angle with Rotary Swivel G1/4" Threads with O-Ring Nickel Finish For Tubing with 1/2" Inner Diameter and 3/4" Outer Diameter *Be sure to screw the collar of the fitting down tightly to make certain that your tubing does not come loose*