Versatile Valve Core Tool for R12 and R134a SystemsThe 81290 Valve Core Remover & Installer is a compact, dual-ended tool designed to service R12 and R134a systems when not under pressure. Built with a durable steel body and precision-fit shafts, the 81290 is a technician favorite for quick valve core ‘s Included:Dual-ended valve core remover/installer toolHardened steel shafts for Standard, JRA, and Eaton large bore cores.