Features: Remove and install the valve core from a 1/4-inch male flare access fitting without the loss of refrigerant. Durable solid brass tool has a ball valve that can be opened and closed in just a quarter-turn rather than a stem-type valve. Designed with a stainless-steel ball for durability and long life. Enclosed the high side and low side coupler. Application Steps: (1)Take a look at the valve core removal. (2)Unscrew the low-side (or high-side if that's what you are fixing) port cap. (3)Connect the valve removal tool. (4)Insert the extractor. (5)Unscrew the old valve core. (6)Pull the valve core up. (7)Remove the valve core. (8)The valve core is now out. (9)Put the new valve core on the rob. (10)Install the new valve core. (11)Place the protective cap back on the low side port. Specification: Condition: 100% Brand New and Never Used. High Pressure: Red coupler, with inner diameter 16mm. Low Pressure: Blue coupler, with inner diameter 13mm. Valve Core: R134/R12. Package Includes: 1 Pc x A/C R134A Valve Core Remover / Installer High Side (Red) 1 Pc x A/C R134A Valve Core Remover / Installer Low Side (Blue)