Description
Overview
The Mueller Industries A17939 is a 7/8″ Magnetic Check Valve engineered for dependable one-directional flow control in HVAC, refrigeration, and related fluid-handling applications. Designed with a magnetic closing mechanism, this check valve provides a positive, leak-resistant seal that prevents backflow and protects system components from pressure reversals and contamination.
Key Features
- 7/8″ connection size for compatibility with standard HVAC and refrigeration tubing
- Magnetic actuation provides a positive, reliable seal against backflow
- Durable construction built to withstand demanding HVAC and refrigeration operating conditions
- Compact design for easy installation in tight spaces
- Helps protect compressors, coils, and other system components from reverse flow damage
Application
The A17939 Magnetic Check Valve is ideal for use in refrigeration circuits, air conditioning systems, heat pumps, and other HVAC applications where backflow prevention is critical. Its magnetic closure mechanism ensures a tight shutoff even at low differential pressures, making it a trusted choice for professional HVAC technicians and contractors.
Why Choose Mueller Industries
Mueller Industries is a globally recognized manufacturer of copper, brass, and related products, with a long-standing reputation for quality and reliability in the HVAC and plumbing industries. The A17939 reflects Mueller’s commitment to precision-engineered components that meet the demands of professional installations.







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