Parker 3GF-5 Brass Flared Tube Seal Bonnet 5/16 in 45 Deg

Product Description

The PARKER 3GF-5 is a brass seal bonnet designed for flared tube connections with a 5/16-inch outside diameter and a 45-degree flare angle. Seal bonnets are used to cap or plug an open flare fitting end, preventing leaks and protecting the connection when a port is not in use or during system service. This fitting is machined from brass for reliable performance in fluid and gas line applications. Licensed plumbers, HVAC technicians, and refrigeration mechanics install this type of fitting as part of copper tubing assemblies in both new construction and maintenance work.

This seal bonnet is suited for residential and light commercial systems where 45-degree SAE flare fittings are standard. Typical applications include capping unused ports on refrigerant lines, fuel gas tubing, hydraulic lines, and compressed air systems. Its brass construction makes it compatible with copper tubing commonly found in HVAC refrigerant circuits, plumbing supply lines, and related trade piping where flare-type connections are specified.

Key Features

• 45-degree flare angle conforms to standard SAE flare fitting geometry
• 5/16-inch tube outside diameter sizing for direct compatibility with same-size flare fittings
• Brass construction provides corrosion resistance and durability in fluid and gas service
• Caps open flare ends to protect connections during service or when ports are not in use
• Compact seal bonnet profile minimizes space requirements in tight tubing runs

Compatibility

Designed as an OEM-style replacement or service fitting for standard 45-degree SAE flare tube assemblies using 5/16-inch outside diameter tubing.

Installation Notes

Installation is performed by licensed HVAC technicians, refrigeration mechanics, or plumbers working with flared copper tubing systems. Always depressurize and isolate the affected line before removing or installing any flare fitting. Hand-tighten the seal bonnet onto the flare nut seat before applying a wrench to avoid cross-threading brass threads. Follow applicable codes such as IFGC or ASHRAE 15 for gas and refrigerant line work.