ColorConnex Coupler & Plug Kit (7 Piece), Industrial Type D, 1/4 in. NPT, Red - A73457D COLOR MATCHING SYSTEM - Easily connect plugs and couplers with same color DEDICATED LINE USE - Ensures you never use a lubricated line for dry line applications, preventing cross contamination INDUSTRIAL INTERCHANGE - Type D in all red color PREMIUM MATERIALS - From the makers of Flexzilla. Made from steel and aircraft aluminum HEAVY DUTY APPLICATIONS - Use on professional jobsites, in automotive shops or at home in the garage