Fitment:Fuel/oil/gas/waterSpecification:Size:AN 4 (female) to 3 (male)AN 4 (female) to 6 (male)AN 6 (female) to 4 (male)AN 6 (female) to 8 ( male)8 (female) to 6 (male)AN 8 (female) to 10 (male)AN 10 (female) to 6 (male)AN 10 (female) to 8 (male)AN 10 (female) to 12 (male) )AN 12 (female) to 10 (male)AN 12 (female) to 16 (male)AN 16 (female) to 12 (male)AN 20 (female) to 16 (male) Product type: female male Reducing adapter Material: anodized 6061 Aluminum Alloy Color: Black Feature: Female Male Single Point Fitting CNC Machined to Aerospace Grade High Quality Anodizing for Durability and Strength Tight Connection Secure and Leak Free AN thread is a specific type of fitting used to connect flexible hoses and rigid metal pipes that carry fluid. It has become popular for use in professional racing, making it easy to adapt new lines. From there it is used spread across the automotive aftermarket performance field for its adaptability, upgradability and durability. Package includes: 1 pcs fit