Alphacool HF G1/4" to 13mm ID, 19mm OD Compression Fitting for Soft Tubing, 45&deg; Rotary, Deep Black, 4-Pack Compression Fitting for Flexible Tubing Tubing Size: 13mm ID, 19mm OD (1/2" ID, 3/4" OD) Thread: G1/4" Material: Brass Color: Deep Black