Thermaltake introduces the Pacific Series Compression fittings for the ultimate in custom PC water cooling configurations. Finished in black-plated copper, the compression fitting includes a base barb and quality O-ring with side printed Tt logo. Choose from: 5/8” and 3/4" OD compression size, Thermaltake fittings provide a complete solution for DIY enthusiasts and PC builders by giving users ideal mounting, fitting and flow.