The Optimus barb fitting is a professional fitting designed for critical cooling applications. With extreme corrosion-resistant Pro-XE nickel and EPDM o-rings, the Optimus barb was originally designedfor a professional AI company requiring absolute reliability and performance in any condition. The Optimus barb fitting uses a single ridge to pair with a hose clamp for maximum holding strength regardless of tubing material. Barb fitting made for 10mm (3/8”) tubing. uS-sourced high grade "360" brass Extreme corrosion-resistant Pro-XE nickel 8mm internal hex socket No knurl design EPDM o-rings BANISHING FLAKY ELECTROPLATED NICKEL Flaking, disintegrating nickel is a widespread problem in liquid cooling. After all, nickel PC fittings and blocks prohibit use with plain water, or you void the warranty. Instead, you must use anti-corrosive fluids to protect nickel components Why? Because the industry standard electroplated (aka electrolytic) nickel is a cosmetic nickel finish that isn't meant to be used in liquid applications. Often called chrome or shiny nickel, electroplated nickel is cost effective and looks good. unfortunately, water, anti-fungals and fancy fluids, including opaques, will rapidly strip electroplated nickel. The gunk that will appear in block fins isn't just broken down fluid, it's often disintegrated nickel, paint and cheap plastics. If this seems crazy, it is. After all, the cheapest home faucet can handle tap water, so why can't expensive PC fittings survive basic H2O? Alas, eletroplated nickel is the PC industry standard. What's the solution? Model: op-fit-barb-10mm