The S.U.R.&R. High Pressure Compression Union Assortment, No. HP200, enable technicians to repair a variety of hydraulic fluid lines, and avoid the need to flare. The HP200 kit contains compression unions designed for heavy duty hydraulic industrial and commercial applications and can be used to connect aluminum, copper, steel, stainless steel, and heavy wall tubing without flaring. Included within the kit are popular 3/16" and 1/4" sizes (two of each). The unions are pressure rated to 5,000 psi. They also meet SAE J512, SAE J514, and SAE J533 specifications for most high-pressure, high-vibration applications but are not recommended for hydraulic brake systems.