EK-Quantum Torque 6-Pack HDC 16 is a fitting multipack containing six EK-Quantum Torque HDC fittings. These are EK's premium 16mm hard-tube compression fittings designed for use with solid tubing such as Acrylic and PETG, offering a non-intrusive, yet striking look with NO added branding. They can be complemented by interchangeable aesthetic color rings, making them an ideal choice for anyone and a perfect match with EK-Quantum series products. To ensure they are undamaged in transport, they are packed in a box cushioned with black foam. The locking ring prevents the solid tube from being pulled out of the fitting by compressing the rubber gasket underneath the ring. The grooves on the outside allow for easier hand tightening. The compression ring has cutouts in the EK Quantum signature shape, allowing the colored aesthetic ring to be shown. The colored rings, available in many colors, are screwed onto the fitting before the compression locking ring.?The aesthetic rings are sold separately. The fitting barb and the compression rings are first nickel-plated, followed by a second plating with genuine gold. Both are made of CNC machined brass, and the seal is made of quality rubber O-rings. These fittings are guaranteed to be compatible with all other EK Water Blocks liquid cooling products. Technical data: - Material: Brass -?Finish: Gold -?Thread: G1/4" BSP; 4.5mm male thread length -?Supported tube: 16mm OD -?The outer diameter of a fitting: 24mm -?Installed height: 15mm -?Compatible solid tubing: Acrylic, PETG, Copper, Brass, Stainless Steel