Mechdynamic Rigid Tubing Compression Fitting, For 1/2in OD Rigid Tubing, Hard Tubing, Color: Obsidian Black, F/ Computer (PC) Water Cooling, Liquid Cooling (4 Pack) Premium grade compression fitting with G1/4 Thread for 1/2in OD rigid tubing (Acrylic, PETG, Stainless Steel, Copper tubing); rated for -20F to 375F, Working Pressure of 125 PSI; designed for extreme computer water cooling systems Featuring Nickel Coated Brass Core and premium grade Fluoropolymer Viton O-rings delivery uncompromising sealing performance Ultra-Low profile design (0.42in tall) allows more room for components and tubing; CNC machined diamond gripping allows fitting cap to be installed and removed without any tools Hexagonal hole allows easy install and removal of the fitting with a 8MM Allen wrench (not included) Patent Pending Flat to Flat seal energizing design is capable of retaining sealing in high vibration working environment