Are you looking to add some subtle colour to your system without all the flashing lights then these fittings allow you to do that. The EK Torque fittings offer the ability to add one of 7 colours to your fitting to match your system colour scheme. Torque series fittings are part of the EK Quantum Product Line that emphasizes minimalistic, elegant design, and performance. For those who want to stand out!EK-Torque STC 10/13 fittings are EK\'s new minimalistic 10/13mm (ID/OD) soft-tube compression fittings designed for use with various flexible soft tubing types such as PVC, EPDM, Norprene, silicone or any other type of compatible flexible tube. With a non-intrusive, yet striking look, and with NO added branding at all. They can be complemented by interchangeable aesthetic color rings, and are an ideal choice for anyone and a perfect match with EK-Quantum series products.The locking ring prevents solid tube to be 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 EK Quantum signature shape allowing for the colored aesthetic ring to be shown. The colored rings are available in many colors and are screwed onto the fitting before the compression locking ring. The aesthetic rings are sold separately.The fitting barb and the compression rings are covered with a unique, high-quality nickel finish. Both are made of CNC machined brass and the seal is made quality rubber O-rings. The base fitting surface 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 Allen Key 9mm (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: Black Nickel- Thread: G1/4\" BSPP; 4.5mm male thread length- Supported tube: 10/13mm (ID/OD)- The outer diameter of a fitting: 20mm- Installed height: 19mm- Compatible soft tubing: PVC, EPDM, Norprene, silicone