The Dual Size Schrader Valve Core Remover/Installer is a versatile tool designed for HVAC/R professionals. With the VIOT brand and model number VT, this valve core remover is essential for removing and installing valve cores in various HVAC and refrigeration systems(not charged). Its dual size capability ensures a secure fit for both standard and large valve cores, making it a must-have for any business or industrial setting requiring maintenance on refrigeration systems. We have another one that works on charged systems: https://viot.store/product_info.php?search_in_description=0&keywords=VT2&sort=1a&products_id=329