EK-Quantum Torque Micro HDP 12 fittings are EK\'s new push-in hard-tube fittings designed for use with 12mm solid tubing such as Acrylic and PETG. They are stealthy and made to be as small as possible, and with NO added branding at all. They are engineered specifically for captive tubing - like runs between two GPU water blocks, or from a GPU to the distro plate. Most importantly, the tube should not be able to move when using these fittings.The solid tube is gripped by the high-quality EPDM rubber gasket inside the Torque Micro HDP fitting. The fitting is made of CNC-machined brass with high-quality satin silver finish. Satin Titanium Quantum Torque series fittings are intentionally not painted on the inside to reduce the level of possible pollutants in the loop. The surface of the fitting is smooth and has no adequate gripping surface, but the inside of the barb is socketed with a 9mm hex Allen key pattern. It\'s highly recommended to use an EK-Loop Multi Allen Key or Allen Key 9mm (both are purchased separately) to prevent skin damage to the fingertips while installing the fitting. Please, be advised not to use excessive force when attaching fitting barbs using Allen Key 9mm in order to prevent damage to other liquid cooling products!These fittings are guaranteed to be compatible with all other EK Water Blocks liquid cooling products.Technical data:- Finish: Satin Silver- Material: Brass- Thread: G1/4\" BSP; 4.5mm male thread length- Supported tube: 12mm OD- The outer diameter of a fitting: 16.5mm- Installed height: 10mm- Compatible solid tubing: Acrylic, PETG, Copper, Brass, Stainless Steel