Mueller Streamline w1170 Male Adapter C X Mpt 1-1/4 X 1-1/2

Product Description

The MUELLER STREAMLINE w1170 is a wrot copper male adapter fitting designed for use in pressurized potable water supply systems. It connects a 1-1/4 inch cup (female solder) end to a 1-1/2 inch male pipe tapered thread (NPT) end, making it a standard C x MPT transition fitting. Weighing 0.48 pounds, the fitting is machined from high-grade wrot copper and meets NSF 61G certification for potable water contact. Licensed plumbers and pipefitters use this fitting to transition from soldered copper lines to threaded connections at valves, supply stubs, and equipment inlets.

This adapter is suited for above-ground potable water supply systems in both residential and light commercial applications. Typical installations include connecting copper distribution lines to threaded shutoff valves, water heaters, pressure regulators, and similar equipment where a solder-to-thread transition is required. The 1-1/4 inch solder cup receives standard Type K, L, or M copper tube, while the 1-1/2 inch MPT end threads into female-threaded fittings or equipment ports.

Key Features

• Wrot copper construction for consistent wall thickness and reliable solder joints
• 1-1/4 inch cup (C) inlet accepts standard copper tube via sweat solder connection
• 1-1/2 inch male NPT outlet threads directly into female-threaded ports and valves
• NSF 61G certified for potable water contact in above-ground supply systems
• Meets ASME B16.22, B16.18, B16.15, B16.24, B16.50, and B1.20.1 standards

Compatibility

Designed as an OEM-style replacement and standard-use fitting for above-ground potable water supply systems requiring a solder cup to male NPT transition at the 1-1/4 inch by 1-1/2 inch size.

Installation Notes

Installation should be performed by a licensed plumber in accordance with applicable local plumbing codes and IPC guidelines. Shut off the water supply and depressurize and drain the line before soldering. Clean and flux the copper tube and cup end per standard practice before applying heat; do not overheat the fitting, as excess heat can damage the joint. Thread the MPT end into the mating female port using appropriate thread sealant or PTFE tape, and tighten to hand-tight plus the manufacturer-recommended turns per code requirements.

Technical Specifications

• Material: Wrot Copper
• First End Type: C - Cup (Female Solder)
• First End Size: 1-1/4 inches
• Second End Type: MPT - Male Pipe Tapered Thread (NPT)
• Second End Size: 1-1/2 inches
• Weight: 0.48 pounds
• Standards: NSF 61G, ASME B16.15, ASME B16.18, ASME B16.22, ASME B16.24, ASME B16.50, ASME B1.20.1

Standard Information

• Brand: MUELLER STREAMLINE
• Manufacturer Part Number: w1170