Viega 90581 Press Adapter 1-1/2 in Press X Mnpt Bronze

Product Description

The VIEGA 90581 is a 1-1/2 inch bronze press adapter designed to transition between a press-fit connection and a male NPT threaded fitting. It is used in hydronic, plumbing, and mechanical piping systems where a tool-pressed joint needs to connect to a threaded pipe or component. The press end accepts standard press tooling, eliminating the need for open flame at the joint. The MNPT end threads into valves, manifolds, pumps, or other threaded fittings. Licensed plumbers and pipefitters are the primary installers of this fitting.

The 90581 fits into commercial and residential plumbing and mechanical systems where press-fit piping infrastructure meets threaded components. Common applications include boiler rooms, hydronic heating distribution, domestic water systems, and mechanical rooms where mixed connection types are present. The adapter simplifies transitions in existing systems being retrofitted with press-fit technology.

Key Features

• 1-1/2 inch press end compatible with standard press tooling
• Male NPT (MNPT) threaded end for connection to valves, manifolds, or threaded pipe fittings
• Bronze construction for corrosion resistance in water-based systems
• No-flame installation on the press side reduces fire risk and simplifies permitting in occupied spaces
• Suitable for both residential and light commercial piping applications

Compatibility

Designed as an OEM-style press-fit adapter for use in 1-1/2 inch press piping systems requiring a transition to male NPT threaded connections.

Installation Notes

Installation of this adapter should be performed by a licensed plumber or pipefitter in accordance with applicable local plumbing codes and ASTM standards. Shut off and depressurize the system and drain standing water from the line before making any connections. Use calibrated press tooling appropriate for the fitting size on the press end, and apply thread sealant or PTFE tape to the MNPT threads before assembly. Do not over-torque the threaded connection, and verify the pressed joint is fully seated before restoring system pressure.

Technical Specifications

• Size: 1-1/2 inches
• Connection Type: Press x MNPT
• Material: Bronze
• Origin: Import

Standard Information

• Brand: VIEGA
• Manufacturer Part Number: 90581