LOKRING Stopper Type 00 with Schrader Valve Connection ❄️🔧 Seal it. Service it. Save time. This all-in-one stopper securely seals refrigerant tube ends and adds a built-in Schrader service port for fast charging, pressure testing, and evacuation. This means no brazing, no flame, no leaks. Perfect for HVAC and refrigeration pros who want faster installs and long-term reliability. Technical Information: • Made for easily adding a service port to a refrigerant circuit • Suitable for R290 and R600a