Make quick 90 degree turns in your hardline tubing system without having to bend or risk breaking your tubing! Fits all 12mm OD Rigid tubing and holds it tightly in place without leaking or breaking any seals! A standard G1/4" thread allows you to attach the multi-link adapter to virtually any standard water cooling part or block! Please Note: This fitting works with 12mm OD hardline tubing only and will not work with standard soft tubing or hardline tubing of other sizes!