Mueller Industries A17940 Magnetic Check Valve for Refrigeration - 1-1/8

The Mueller Industries A17940 is a professional-grade magnetic check valve designed for HVAC and refrigeration applications. This 1-1/8" inline check valve prevents undesirable reverse flow in refrigerant lines, ensuring proper system operation and protecting expensive compressor equipment.

Key Features:

• 1-1/8" ODS (Outside Diameter Sweat) connections for copper tubing
• Magnetic design for reliable sealing and near-zero leak rate
• Maximum operating pressure of 700 PSI
• 6-ton capacity (R22, suction at 40°F evaporator, 1 PSI ΔP)
• Built-in stainless steel strainer for system protection
• Spun copper construction for durability
• Can be installed in any position without affecting performance
• Compatible with hard or soft solder installation

Part of Mueller's CHECKMASTER series, this check valve is engineered to control flow direction in refrigerant piping systems, allowing flow in one direction while preventing reverse flow. The brass and copper construction ensures long-lasting performance in demanding commercial and residential HVAC applications.