This Fitting Assortments are designed for specialty and general repair shops. Each assortment contains a specific collection of fast moving fittings that should be kept on hand when working with automotive hydraulic braking systems. Compression Union Assortment - 6 SKU An assortment that contains 1/8", 3/16", 1/4", 5/16", 3/8", and 1/2" compression unions for joining copper, brass, or aluminum tubing in low-pressure applications (not for use in braking systems). Kit contains 6sizes: 1/8"(2 pcs), 3/16"(10 pcs), 1/4"(4 pcs), 5/16"(2 pcs), 3/8"(2 pcs) and 1/2" (2 pcs)compression coupling, total 22pcs. Each assortment contains a specific collection of fast moving fittings that should be kept on hand when working with automotive hydraulic braking systems. This compression union assortments are designed for specialty and general repair shops. Meets specifications and standards of ASA, ASME asn SAE. Compression unions for joining copper, brass, or aluminum tubing in low-pressure applications