The MERLIN® color-coded system helps to efficiently match the same series couplers and plugs. Use the color-coded system to distinguish between air lines, such as high and low pressure or lubricated and non-lubricated lines. Scratch-resistant, anodized coating for optimal wear vs. traditional aluminum sleeves. Compatible with all standard MERLIN® and competitive I/M (Industrial) Series couplers and plugs, as well as red couplers and plugs in competitive color match systems.