The one I received was very difficult to use as the pin holding the valve core pivot piece protruded very easily and caught in the gasket. I tried inserting a pen but it didn't work. I ended up sanding it smooth and now the tool works perfectly. This defect should have been obvious to the person who assembled the instrument. If your plunger isn't pushing smoothly, take a good look at the pin and sand it down if it's not completely flush.
Robust Robinair (RG3) Portable Refrigerant Recovery Machine, 115V, 60Hz -Efficiently Recovers Liquid and Vapor Refrigerant
9 Review
💪 Enhanced Universal R134A Valve Core Remover/Installer by Mastercool (81290)
9 Review
VIVOHOME 220LB HVAC Electronic Digital Refrigerant Charging Weight Scale – High Precision with Protective Case
9 Review
🔍 UView 560000 Combustion Leak Tester: A Reliable Tool for Efficient Diagnosis
9 Review