1/2 inch PEX Brass Insert Coupling Crimp x Crimp

46630 Viega PEX to Polybutylene Adapter – 1/2 inch x 1/2 inch Lead-Free Brass Transition Fitting

The 46630 Viega PEX PB Adapter provides a mechanical transition between 1/2 inch PEX (cross-linked polyethylene) and 1/2 inch polybutylene tubing. This component is manufactured from lead-free brass and is intended for potable water distribution systems, including both retrofit and new construction scenarios where legacy PB systems are present.

This adapter features a PEX end compatible with ASTM F1807 crimp or clamp connection methods and a PB end designed to mate with 1/2 inch nominal polybutylene tubing. The fitting meets NSF/ANSI 61 and NSF/ANSI 372 requirements and is certified as compliant with the Reduction of Lead in Drinking Water Act.

Product Specifications

• Manufacturer: Viega
• Part Number: 46630
• Connection Type: 1/2 inch PEX x 1/2 inch PB
• Material: Lead-free brass (< 0.25% weighted average lead content)
• Standards: ASTM F1807 (PEX side), NSF 61/372, CSA B137.5 (PB side)
• Applications: Potable water distribution, hydronic heating, and approved retrofit applications

Installation Guidelines

PEX end requires use of ASTM F1807-compliant crimp rings or stainless steel cinch clamps. PB end is installed with an approved PB clamp ring. Verify tube compatibility prior to installation. Proper tool calibration and pressure testing in accordance with local plumbing codes are essential to ensure system integrity.

Typical Applications

This adapter is used primarily in plumbing systems where existing polybutylene lines are being integrated with or converted to PEX tubing. It is suitable for both residential and light commercial systems where a material transition is required in accordance with code.

Regulatory Compliance

Federal and state regulations mandate the use of lead-free components in potable water systems. This adapter complies with the Safe Drinking Water Act and is certified by recognized third-party agencies for use in domestic water applications.

The 46630 Viega 1/2 inch PEX x PB Adapter is a purpose-built transition fitting designed for system compatibility, reliability, and long-term performance in regulated water distribution systems.