R-438A (MO99) Refrigerant – 25 lb Factory-Sealed Cylinder

R-438A, also known as MO99, is an AHRI-700 certified, virgin A1 refrigerant built as a versatile R-22 alternative for existing DX air-conditioning and refrigeration systems. It's compatible with mineral oil, alkylbenzene, and POE oils, simplifying many retrofits without a routine oil change.

What You Get

• 25 lb factory-sealed cylinder, 100% virgin refrigerant
• AHRI-700 certified purity
• A1 – non-flammable classification
• Compatible with MO, AB, and POE lubricants
• Built to simplify retrofit installation

Best for: residential and commercial A/C, rooftop units, walk-in coolers, and DX chillers.

Please note: confirm equipment compatibility and follow the manufacturer's specifications and applicable regulations before retrofitting.

Why Purity & Certification Matter

Refrigerant purity has a direct effect on system performance and equipment life. Non-condensable gases, moisture, or residue in a charge can raise head pressure, reduce cooling capacity, and shorten compressor life. Buying a factory-sealed, virgin charge – rather than reclaimed or repackaged product of unknown origin – is the simplest way to protect the equipment you're servicing.

Frequently Asked Questions

• Is this a drop-in replacement for another refrigerant?
  R-438A (MO99) is built for existing DX R-22 systems – confirm equipment compatibility before retrofitting.
• What does the A1 safety classification mean?
  It's a refrigerant industry safety rating. This product is classified A1 (non-flammable), which describes its flammability under ASHRAE/ISO guidelines and determines what handling and installation precautions apply.
• Can this be shipped, and how should it be stored?
  Refrigerants are regulated hazardous materials and generally ship via ground freight under DOT rules. Store the cylinder upright in a cool, dry, well-ventilated area out of direct sunlight, and keep it away from heat sources.