1 inch PEX Brass Insert Adapter Crimp x Female

46355 Viega BRS PEX Adapter – 1 inch PEX x 1 inch FNPT Transition Fitting

The 46355 Viega BRS PEX Adapter provides a secure transition between 1 inch PEX tubing and 1 inch female NPT-threaded connections. Manufactured from lead-free brass and designed for use in potable water systems, this fitting supports compliant and durable system design in residential and commercial plumbing installations.

This adapter uses a PEX crimp/barb end for flexible tubing connections and a standard female NPT outlet, making it suitable for integrating PEX distribution lines with threaded valves, risers, or metallic system components. It meets applicable ASTM and NSF standards for pressure-bearing potable water applications.

Technical Specifications

• Manufacturer: Viega
• Part Number: 46355
• Material: Lead-free brass (meets NSF/ANSI 61 and 372)
• Connection 1: 1 inch PEX (crimp/barb style, ASTM F1807 compatible)
• Connection 2: 1 inch Female National Pipe Thread (FNPT)
• Application Type: Cold/hot potable water systems, hydronic heating
• Standards Compliance: ASTM F1807, NSF 14/61, CSA B137.5, ANSI 372

Installation Guidelines

Install using ASTM F1807-compatible crimp rings and a calibrated crimp tool. The PEX barb must be inserted fully into the tubing and crimped within manufacturer-specified tolerances. Apply approved thread sealant or PTFE tape to the NPT threads when connecting to threaded fittings or manifolds. Pressure testing should follow local code and manufacturer protocol post-installation.

Use Applications

Used in PEX-based water distribution systems, this adapter is typically installed at termination points, mixing valves, branch connections, and threaded transitions. Common in slab rough-ins, mechanical rooms, and manifold outlet configurations. Suitable for both new construction and system retrofits requiring metal-to-PEX compatibility.

Material Insight

Viega BRS fittings are forged from dezincification-resistant (DZR) brass, offering improved corrosion resistance in aggressive water conditions. The lead-free alloy ensures compliance with federal Safe Drinking Water Act (SDWA) requirements.

Code-Compliant PEX-to-NPT Transition for Pressurized Systems

The Viega 46355 BRS PEX Adapter is engineered for long-term performance in potable water and hydronic systems, combining mechanical durability with regulatory compliance. Its dual-connection format enables flexible integration between PEX and threaded system components in professional-grade plumbing installations.