Parker AVUS4D-4 Flare Swivel Nut Access Valve 500 Psi

Product Description

The PARKER AVUS4D-4 is a brass flare swivel nut connector access valve rated for a maximum working pressure of 500 psi. It is designed for use in refrigeration systems where a reliable, leak-free service port connection is required. The valve accepts 0.25 inch tube outside diameter flare fittings and features a swivel nut design that allows the connector to rotate during makeup, reducing torque transfer to the system tubing. HVAC and refrigeration technicians install this valve as a service access point on refrigerant circuits, enabling gauge set hookup and system charging or recovery without disturbing the main line connections.

This access valve is suited for residential and light commercial refrigeration and air conditioning applications. It fits into systems where a 0.25 inch OD flare connection is the specified port interface. The swivel nut configuration is commonly used on liquid line and suction line service ports, as well as on manifold gauge adapters and recovery equipment hookups. It is packaged individually and is a direct-install component requiring no additional hardware beyond a properly flared tube end.

Key Features

• 500 psi maximum working pressure rating suitable for common refrigerant service pressures
• Flare swivel nut connector design allows rotation during fitting makeup to reduce line stress
• 0.25 inch tube outside diameter flare interface for standard refrigeration line connections
• All-brass construction for corrosion resistance and compatibility with refrigerants and refrigeration oils
• Compact, single-piece valve body for straightforward installation in tight service spaces

Compatibility

Designed as an OEM-style replacement or service component for refrigeration and air conditioning systems using 0.25 inch OD flare-type access valve connections.

Installation Notes

Installation should be performed by a licensed HVAC or refrigeration technician in accordance with applicable EPA Section 608 regulations and local mechanical codes. Recover or isolate refrigerant from the circuit before removing or replacing any access valve. Ensure the mating flare is properly formed and free of burrs before making up the swivel nut connection. Do not overtighten the swivel nut, as brass flare fittings can deform and leak if excess force is applied.