Parker 322HB-5PP Barbed Tube Union 5/16 in Polypropylene

Product Description

The PARKER 322HB-5PP is a barbed tube union connector designed to join two lengths of flexible tubing in a straight-line configuration. Molded from polypropylene, this fitting resists common chemicals and moisture, making it well-suited for low-pressure fluid transfer lines in HVAC condensate, plumbing, pool, and general pneumatic or liquid-handling applications. The 5/16 inch barb size secures standard flexible tubing with a push-on fit, and the black color aids quick visual identification in mixed-line installations. Licensed plumbers, HVAC technicians, and pool service professionals install this type of fitting where a leak-resistant, tool-free tube connection is needed in tight or remote service locations.

This union connector is used in residential and light commercial systems where flexible tubing runs require a mid-line splice or a field connection between two tube ends. Typical install scenarios include condensate drain lines, chemical feed lines, irrigation sub-lines, and pool or spa equipment plumbing where polypropylene chemical compatibility is an advantage over metal fittings. The 5/16 inch barb size matches common small-bore flexible tubing used throughout these trades.

Key Features

• Union connector design joins two flexible tube ends in a straight-line configuration
• 5/16 inch barbs provide a secure push-on grip without clamps or tools in low-pressure service
• Polypropylene construction offers chemical and moisture resistance
• Black color aids visual identification in multi-line installations
• Compact form factor fits in confined equipment bays and tight plumbing chases

Compatibility

Designed as an OEM-style replacement or field-install fitting for 5/16 inch inside diameter flexible tubing used in low-pressure HVAC, plumbing, pool, and fluid transfer applications.

Installation Notes

This fitting is installed by HVAC technicians, plumbers, and pool service professionals working on low-pressure fluid lines. Before servicing any connected system, shut off the fluid supply and relieve line pressure. Ensure the tubing inner diameter matches the 5/16 inch barb size for a secure, leak-free connection. For pressurized lines, verify the operating pressure does not exceed the rating of both the fitting and the tubing being used.