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The YELLOW JACKET 49518 is a Ritchie Blue liquid filled refrigeration gauge designed for use in HVAC and refrigeration service work. Liquid filled gauges dampen needle vibration caused by compressor pulsation, making pressure readings easier to read accurately in the field. This gauge is built for the demands of regular service use and is installed by licensed HVAC and refrigeration technicians as part of a manifold set or as a standalone service gauge.
The 49518 is suited for residential and light commercial HVAC and refrigeration applications where stable, accurate pressure readings are required. The Ritchie Blue liquid fill helps protect internal components from moisture and vibration, extending service life in demanding field conditions. It is commonly used during system diagnosis, refrigerant recovery, evacuation, and charging procedures.
Designed as an OEM-style replacement or service gauge for use in standard refrigeration and HVAC manifold gauge set applications.
Installation and service should be performed by a licensed HVAC or refrigeration technician in accordance with applicable industry standards and EPA Section 608 regulations. Always recover refrigerant and depressurize the system before disconnecting or replacing gauges. Handle liquid filled gauges carefully to avoid cracking the lens or damaging the fill seal, which can result in fluid loss and inaccurate readings.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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