The Thermaltake Pacific Compression series provides a complete solution for enthusiast and custom PC builders to meet the needs of setting up a complete water cooling system. With G1/4" durable copper fittings take every detail seriously. Compatible with PETG Tube 5/8" OD to make your system a showcase for all to see with high-quality components from Thermaltake. The fittings allow proper connection to G1/4" ports, securing properly to cooling components while providing an even seal around the tubing.