Straight Anti-Blowback Adapter 5/16" to 1/4" Male

Anti-blowback swivel adapter with 5/16" to 1/4" male flare and 1/2"-20 female thread. Ideal for HVAC refrigerant lines and mini split systems.

The HCPRO Straight Anti-Blowback Adapter (5/16" to 1/4") is a professional-grade HVAC tool designed for technicians working with mini split AC systems, VRF units, ductless air conditioners, and central HVAC systems. Featuring a 5/16" SAE male flare, 1/4" flare outlet, and 1/2"-20 female thread, this anti-blowback fitting helps ensure leak-free, reliable refrigerant line connections in high-pressure systems.

Engineered to minimize refrigerant loss during hose disconnection, this R410A adapter protects critical components like compressors and expansion valves from contamination and moisture. It’s ideal for charging, vacuum, and recovery applications using R410A, R32, R134a, or R22. The straight-line design provides a compact and durable solution that fits easily into your HVAC tool kit or AC service set.

Whether you're performing maintenance on a ductless mini split, VRF multi-zone system, or commercial air conditioning unit, this adapter delivers safe, efficient, and precise performance. Trusted by HVAC technicians, installers, and refrigeration pros, it's compatible with most refrigerant hoses, manifold gauge sets, and vacuum pumps.

• Straight Anti-Blowback Adapter – Prevents refrigerant discharge during disconnection for safe AC service.
• 5/16" SAE to 1/4" Male Flare – Compatible with mini split tools, HVAC hoses, and gauge manifolds.
• Perfect for R410A, R32, R134a – Works with residential, commercial, and automotive AC refrigerants.
• VRF System Compatible – Trusted solution for multi-zone inverter systems and tight refrigerant lines.
• Brass Body with 1/2"-20 Female Thread – Delivers corrosion resistance and high-pressure sealing.
• Essential for HVAC Technicians – Fits your charging hose, recovery machine, or vacuum pump system.

Why HVAC Techs Use Anti-Blowback Adapters on VRF Systems

1. Prevents Refrigerant Loss During Disconnection

• VRF systems operate with high system pressure and often use expensive refrigerants (typically R410A).
• An anti-blowback valve prevents a sudden discharge of refrigerant when disconnecting service hoses, preserving system charge and protecting technicians.

2. Minimizes System Contamination

• These adapters seal the service line quickly upon disconnection, reducing air or moisture ingress, which is critical for VRF systems due to their sensitivity and long refrigerant piping runs.

3. Protects Compressor and Components

• Blowback can allow contaminants or moisture into the lines, which can damage electronic expansion valves (EEVs) and inverter compressors commonly found in VRF systems.
• This adapter helps maintain internal cleanliness.

4. Supports Safe & Precise Servicing

• VRF systems are complex and often support multiple indoor units. Service mistakes (like losing charge) can cause system-wide issues.
• These adapters ensure secure, clean, and pressure-controlled service when connecting gauges or recovery systems.
• 5. Improves Access in Tight Installations
• Many VRF systems are installed in tight mechanical rooms or rooftops, and the 90-degree design allows for better hose routing without kinking or stressing connections.

6. Required or Recommended by Manufacturers

• Some VRF system OEMs (like Daikin, Mitsubishi, LG) recommend or require anti-blowback fittings to avoid warranty-voiding service mistakes.

- Female End: 5/16″ Industrial Interchange (II) or 5/16″ NPT
- Male End: 1/4″ NPT with 1/2″-20 UNF collar

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