Poor quality. They leak over time, causing freon to leak. Do not worry. Even when tightened properly, they're worse than the Schrader valves you have now. Just replace them.
๐จ Robinair (15115) VacuMaster Single Stage Vacuum Pump - For Efficient Single-Stage Vacuuming, Delivers 1.5 CFM
9 Review
Robust Robinair (RG3) Portable Refrigerant Recovery Machine, 115V, 60Hz -Efficiently Recovers Liquid and Vapor Refrigerant
9 Review
๐ช Enhanced Universal R134A Valve Core Remover/Installer by Mastercool (81290)
9 Review
๐ฌ๏ธ UView Airlift Cooling Checker 550000
9 Review