Uponor Q4351500 Propex Plug 1-1/2 Inch Polyphenylsulfone

Product Description

The UPONOR Q4351500 is a ProPEX end-style plug designed to terminate or cap off 1-1/2 inch nominal PEX piping lines. Constructed from polyphenylsulfone (PPSU), this plug delivers high heat and chemical resistance suited to demanding hydronic and plumbing applications. It is installed using the ProPEX expansion method, where the fitting is expanded before the PEX pipe is inserted, then allowed to contract for a secure, leak-resistant seal. Plumbing and mechanical contractors working with Uponor PEX systems will find this plug a direct fit for capping open branch lines or isolating portions of a system during installation or service.

This plug is intended for use in residential and light commercial PEX plumbing and radiant heating systems where a 1-1/2 inch nominal ProPEX termination is required. Typical applications include capping unused manifold ports, terminating branch lines, or sealing off portions of a hydronic distribution system. The domestic designation indicates U.S. origin, which may be relevant for projects with domestic-content procurement requirements.

Key Features

• ProPEX expansion-style end connection for a reliable, tool-driven mechanical seal
• Polyphenylsulfone (PPSU) construction offers superior heat resistance compared to standard nylon or acetal fittings
• 1-1/2 inch nominal size suits larger branch and main-line termination points
• Domestically manufactured, suitable for Buy American or domestic-content compliance requirements
• Clean termination without the need for solvents, clamps, or open flames

Compatibility

Designed as an OEM-style ProPEX fitting for use with 1-1/2 inch nominal PEX piping systems utilizing the Uponor ProPEX expansion connection method.

Installation Notes

Installation requires a ProPEX expansion tool sized for 1-1/2 inch fittings. Shut off system water supply and depressurize the line before capping any open port. Follow applicable plumbing codes including IPC and local amendments for PEX fitting installation. Do not use this fitting with crimp-ring or clamp-style PEX connection systems.

Technical Specifications

• Nominal Size: 1-1/2 inches
• Connection Style: ProPEX Expansion
• Material: Polyphenylsulfone (PPSU)
• Country of Origin: Domestic

Standard Information

• Brand: UPONOR
• Manufacturer Part Number: Q4351500