AGS Fitting Assortments contain a specific collection of fast moving fittings that should be kept on hand when working with automotive hydraulic braking systems. Assortments are packaged in shatter-resistant, see-through plastic trays. Locator labels on the inside lid make locating, selecting, and re-filling quick and easy. Master Cylinder Adapter Assortment – 9 SKU. Nine of the most popular master cylinder adapters for Domestic vehicles. Adapt different sized port openings on master cylinders to standard 3/16" and 1/4" Domestic brake systems. Also includes adapters for converting between 5/16" and 3/8" port sizes.