Ay Mcdonald 4423-394 Pex-a Poly Insert Tee 3/4x1/2x3/4

Product Description

The AY MCDONALD 4423-394 is a PEX-A poly insert tee fitting designed for use in PEX-A tubing systems. This fitting connects three lines in a tee configuration with port sizes of 3/4 inches, 1/2 inches, and 3/4 inches. The poly insert construction is compatible with PEX-A expansion-style piping, making it a reliable choice for residential and light commercial plumbing and radiant heating installations. Licensed plumbers and pipefitters install this fitting as part of supply line distribution, branch takeoffs, and hydronic loop assemblies.

This tee fitting is suited for residential potable water distribution systems and radiant floor heating applications where PEX-A tubing is the specified pipe material. The reducing center port at 1/2 inches allows a branch takeoff from a 3/4 inches main run, a common configuration in home plumbing trunk-and-branch layouts and manifold bypass runs. It is also used in commercial light-duty hydronic systems where PEX-A is approved by the local authority having jurisdiction.

Key Features

• Three-port tee configuration: 3/4 inches x 1/2 inches x 3/4 inches for reducing branch takeoff
• Poly insert construction compatible with PEX-A expansion tubing systems
• Single order increment allows purchase in exact quantities needed
• Suitable for both potable water and hydronic heating applications

Compatibility

Designed as an OEM-style insert fitting for PEX-A tubing systems using expansion-style connections in residential and light commercial plumbing applications.

Installation Notes

Installation should be performed by a licensed plumber in accordance with the International Plumbing Code and applicable local codes. Shut off the water supply and depressurize the line before cutting into existing piping. PEX-A insert fittings require the appropriate expansion tool and ring size matched to each port diameter — do not substitute crimp or clamp hardware designed for other PEX types. Inspect the fitting for cracks or deformation before installation.

Technical Specifications

• Configuration: Tee
• Port Sizes: 3/4 inches x 1/2 inches x 3/4 inches
• Material: Poly Insert
• Tubing Compatibility Type: PEX-A
• UPC: 811734022745
• Order Increment: 1

Standard Information

• Brand: AY MCDONALD
• Manufacturer Part Number: 4423-394