The Mastercool Dual Refrigerant Manifold, No. 78-3876, for NAPA can help technicians perform pressure checks, leak tests and add refrigerant. This set is designed for use on all R134A and R-12 vehicles. The 78-3876 incorporates a sight-glass within its aluminum body for visual verification of refrigerant flow. Heavy duty manual couplers allow for the precise control of refrigerant and tank adapter. This kit includes 96” hoses.