Alphacool HF G1/4" to 10mm ID, 16mm OD Compression Fitting for Soft Tubing, 90&deg; Rotary, Deep Black, 4-Pack Compression Fitting for Flexible Tubing Tubing Size: 10mm ID, 16mm OD (3/8" ID, 5/8" OD) Thread: G1/4" Material: Brass Color: Deep Black