Parker 322HB-4-3N Barbed Tube Union Connector 1/4x3/16

Product Description

The PARKER 322HB-4-3N is a single-barb tube union connector designed to join two flexible tubes of differing inside diameters in a straight inline configuration. Built from white nylon, this fitting accepts a 1/4-inch tube ID on one end and a 3/16-inch tube ID on the other, with corresponding outside diameter fitment of 0.31 inches and 0.25 inches. It carries a maximum working pressure of 125 psi and an operating temperature range of -40 degrees F to 200 degrees F. Meeting FDA compliance and NSF/ANSI 51 certification, this connector is suited for fluid-handling systems where food-zone or potable-water contact is a consideration. Plumbers, refrigeration technicians, and equipment service pros are the typical installers.

This connector is used in low-pressure fluid transfer lines found in commercial foodservice equipment, beverage dispensing systems, water filtration assemblies, and light HVAC condensate or drain tubing applications. The reducer union configuration makes it practical when tubing sizes change between components within the same fluid circuit. Its nylon construction resists corrosion and is compatible with a range of non-aggressive aqueous media. The overall installed length of 1.61 inches keeps the assembly compact in tight equipment bays or panel enclosures.

Key Features

• Single-barb reducer union joins 1/4-inch ID tubing to 3/16-inch ID tubing in one fitting
• Nylon construction provides corrosion resistance for aqueous and low-chemical-exposure fluid lines
• Rated to 125 psi maximum working pressure
• Wide service temperature range: -40 degrees F to 200 degrees F (-40 degrees C to 93.3 degrees C)
• FDA compliant and NSF/ANSI 51 certified for food-equipment fluid contact applications
• Compact overall length of 1.61 inches suits confined equipment spaces

Compatibility

Designed as an OEM-style replacement or service fitting for flexible tubing systems requiring a straight union connection between 1/4-inch and 3/16-inch inside diameter tubing in food-contact or potable-water-adjacent applications.

Installation Notes

Depressurize and drain the fluid circuit completely before removing or installing barbed fittings. Push flexible tubing firmly over each barb until seated against the fitting shoulder; use hose clamps where system pressure or vibration may cause pull-off. Verify that the tubing material and durometer are compatible with the media temperature and pressure before commissioning. Installation should comply with applicable local plumbing codes and equipment manufacturer service procedures.