Thermaltake Pacific DIY LCS G1/4" PETG Tube 16mm (5/8") OD Compression Fitting CL-W092-CA00SL-A Silver High flow Leak free design: fittings allow proper connection to G1/4 Ports, Securing properly to cooling components while providing an even seal around the tubing. Chrome plated copper fitting PETG 16mm (5/8") Tube compliant: connector to PETG Tube Triple O-Ring with compression Sleeve 2 year Warranty