Fitment Reimagined - By rethinking the traditional compression fitting design, this new concept makes it easier than ever to install custom hard tube liquid-cooling loops, especially when working with tight spaces. Four Built in O-rings - Maximum leak prevention, secure compression seal, and peace of mind. Protection You Expect - Surface treated and a special coating finish provides increased durability and protection from corrosion. Build It Your Way - Compatible with liquid cooling components that utilize G1/4 thread ports and 16mm OD PETG, Acrylic, and Copper hard tubing.