Nibco B034100 Cast Copper Adapter 3/4x1 in Ftg X Mnpt

Product Description

The NIBCO B034100 is a cast copper pressure fitting adapter designed to transition between a sweat (FTG) socket end and a male NPT threaded connection. It measures 3/4 inch on the fitting end and 1 inch on the male threaded end, making it a reducing adapter used to step up thread size while changing connection type. Built from cast copper conforming to ASTM B584, it is suited for potable water, hydronic, and general plumbing pressure applications. Licensed plumbers and pipefitters install this fitting in both new construction and retrofit work wherever a sweat-to-male-thread transition is required.

This adapter is used in residential and light commercial plumbing systems where copper supply lines must terminate at or connect to a male NPT threaded port. Typical install scenarios include water heater connections, valve hookups, manifold assemblies, and branch line transitions. The 3/4 inch FTG socket receives a 3/4 inch copper tube for soldering, while the 1 inch MNPT end threads into a female-threaded fitting, valve body, or equipment port. It is sold individually with a minimum order quantity of one.

Key Features

• Cast copper construction meets ASTM B584 and ISO standards for pressure fittings
• 3/4 inch FTG socket accepts standard 3/4 inch copper tube for sweat soldering
• 1 inch MNPT threaded outlet connects to female NPT valves, ports, or fittings
• Reducing adapter configuration allows size and connection-type transition in a single fitting
• Pressure fitting style rated for use in water supply and hydronic piping systems

Compatibility

Designed as an OEM-style pressure fitting for use in copper piping systems requiring a sweat-to-male-NPT transition; compatible with standard 3/4 inch copper tube on the FTG end and any female NPT 1 inch threaded port or fitting on the threaded end.

Installation Notes

Installation is performed by a licensed plumber following applicable IPC and local plumbing code requirements. Shut off the water supply and depressurize the line before soldering or threading. Clean and flux the copper tube before inserting into the FTG socket, and apply thread sealant or PTFE tape to the MNPT threads before assembly. Do not overtighten threaded connections or apply heat near completed threaded joints.