Viega 91580 Press X Fnpt Adapter 1-1/2 Inch Bronze

Product Description

The VIEGA 91580 is a 1-1/2 inch bronze press adapter designed to transition between a press-style connection and a female National Pipe Thread (FNPT) fitting. It is part of the VIEGA PureFlow Press system, which uses cold-press crimping technology to create leak-free joints without open flame. This adapter suits potable water and hydronic piping systems in commercial and residential construction. Licensed plumbers and pipefitters install this fitting where a press-end pipe or tubing run must connect to a threaded valve, manifold, or equipment port. The bronze construction provides corrosion resistance in wet service environments.

This adapter is used in new construction and retrofit plumbing projects where the PureFlow Press system is the specified installation method. It is well-suited for mechanical rooms, boiler rooms, and domestic water distribution systems. The press end accepts standard PureFlow-compatible tubing, while the FNPT end threads onto valves, strainers, pumps, or other threaded components. Installation does not require soldering, flux, or torch work, which reduces fire risk in occupied or sensitive jobsite conditions.

Key Features

• 1-1/2 inch press x FNPT configuration allows direct transition from press tubing to threaded piping components
• Bronze construction provides durability and corrosion resistance in potable water and hydronic service
• Cold-press installation eliminates open flame, reducing fire hazard on jobsites
• Compatible with VIEGA PureFlow Press tooling and jaw sets for consistent, auditable connections
• FNPT end accepts standard pipe thread engagement for valves, meters, and equipment ports

Compatibility

Designed for use with the VIEGA PureFlow Press system. Compatible with 1-1/2 inch press-end tubing and standard FNPT-threaded components. Verify press jaw and ring compatibility with VIEGA tooling specifications before installation.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with local plumbing codes and the applicable International Plumbing Code (IPC) requirements. Shut off the water supply and depressurize the system before beginning work. Use only the manufacturer-approved press tool and correct jaw size for the 1-1/2 inch connection to ensure a properly formed joint. Inspect each pressed connection for the visual indicator that confirms full crimp engagement before returning the system to service.

Technical Specifications

• Connection Size: 1-1/2 inches
• Connection Type: Press x FNPT
• Material: Bronze

Standard Information

• Brand: VIEGA
• Manufacturer Part Number: 91580