Ay Mcdonald 4423-393 Pex-a Poly Insert Tee 3/4x1/2x1/2

Product Description

The AY MCDONALD 4423-393 is a PEX-A poly insert tee fitting designed for use in PEX-A tubing systems. This three-port fitting connects a 0.75-inch run to two 0.5-inch branch or continuation lines, making it a go-to component for branching water distribution runs. Constructed from polymer material, the insert-style design seats inside the PEX-A tubing and is secured with crimp rings or clamp rings depending on the installer's tooling preference. Plumbers and pipefitters install this fitting during rough-in and retrofit work on potable water and hydronic heating systems.

This fitting is suited for residential and light commercial plumbing applications where PEX-A tubing is the distribution medium. Typical install scenarios include home-run manifold systems, trunk-and-branch layouts, and radiant heating loops where a 0.75-inch supply line needs to reduce and split to 0.5-inch branch lines. Its all-polymer construction makes it appropriate for use where metal fittings are undesirable due to corrosion concerns or local water chemistry.

Key Features

• Tee configuration: 0.75 inches x 0.5 inches x 0.5 inches for branching reduced lines
• Compatible with PEX-A tubing systems using insert-style connection method
• Polymer construction resists corrosion and scale buildup
• Insert design works with standard crimp ring or clamp ring installation tools
• Order increment of 1 for single-unit purchasing flexibility

Compatibility

Designed as an OEM-style insert fitting for PEX-A tubing systems requiring a reducing tee transition from 0.75-inch to 0.5-inch lines.

Installation Notes

Installation is performed by licensed plumbers following applicable IPC and local plumbing code requirements. Shut off the water supply and depressurize the line before cutting into any existing PEX run. Use a properly calibrated PEX crimp or clamp tool to secure the appropriate rings over the tubing once the insert is fully seated. Do not use this fitting with PEX-B or PEX-C tubing without verifying compatibility with the fitting manufacturer.

Technical Specifications

• Connection Size: 0.75 inches x 0.5 inches x 0.5 inches
• Connection Type: PEX-A Insert
• Fitting Configuration: Tee
• Material: Polymer
• UPC: 811734022738

Standard Information

• Brand: AY MCDONALD
• Manufacturer Part Number: 4423-393