Parker 22-4 Barbed Tube Union 0.17 in Id Brass

Product Description

The PARKER 22-4 is a brass barbed tube union designed to join two sections of flexible tubing in low-pressure fluid or pneumatic lines. It features a multiple-barb design on both ends, which provides a secure mechanical grip on the tubing without requiring clamps in light-duty applications. The fitting accepts tubing with an inside diameter of 0.17 x 0.17 inches and an outside diameter of 1/4 inch. Fabricated from brass, it offers good corrosion resistance and compatibility with a wide range of non-aggressive media. HVAC technicians, plumbers, and refrigeration service techs install this type of fitting when making inline tubing connections in tight spaces or low-pressure secondary circuits.

This barbed tube union is suited for residential and light commercial applications where flexible tubing — such as polyethylene, vinyl, or similar soft-wall tubing — must be joined in-line. Common install scenarios include condensate drain lines, chemical feed tubing, instrumentation sampling lines, and low-pressure pneumatic control circuits. The compact brass body makes it a practical choice where space is limited and a solderless, tool-free connection is acceptable for the service conditions.

Key Features

• Multiple-barb profile on both ends for a secure grip on soft-wall tubing
• Brass construction provides corrosion resistance in a broad range of fluid service environments
• Accepts 0.17 x 0.17 inch inside diameter tubing with 1/4 inch outside diameter
• Solderless, push-on installation requires no special tooling
• Compact union body suitable for tight-space inline connections

Compatibility

Designed as an OEM-style inline union for flexible soft-wall tubing with a 0.17 inch inside diameter and a 1/4 inch outside diameter, typical of polyethylene, vinyl, and similar tubing used in low-pressure fluid and pneumatic service lines.

Installation Notes

This fitting is installed by licensed HVAC technicians, plumbers, or refrigeration mechanics working on low-pressure secondary circuits. Before servicing any connected line, shut off flow and depressurize the system. Push tubing firmly over each barbed end to ensure full seating past all barb ridges. Verify that the tubing wall is free of cuts or deformation before assembly, as a compromised tube wall will not seal reliably on the barbs.