Mueller Streamline w01571 Copper Adapter Fitting Ftg X Fpt 1-1/4 Inches

Product Description

The Mueller Streamline W01571 is a wrot copper adapter fitting designed for use in above-ground potable water supply and pressurized plumbing systems. This fitting connects a male solder end, known as an FTG or fitting end, to a female pipe tapered thread, also called FPT or NPT. The 1-1/4 inch size on both ends makes it a straight adapter that transitions between a soldered copper line and a threaded pipe connection without reducing flow capacity. Plumbers and pipefitters rely on this type of adapter when joining copper tubing runs to threaded valves, fixtures, or equipment in residential, commercial, and light industrial settings. The wrot copper construction delivers excellent pressure ratings, corrosion resistance, and long service life in water supply applications. Wrot copper is manufactured by a forming process that aligns the grain structure of the metal, resulting in a denser, stronger fitting compared to cast alternatives. This makes the W01571 well suited for systems that demand consistent, leak-free performance over many years. Mueller Streamline has been producing solder-joint copper fittings for over 80 years and is recognized as one of the most trusted names in the copper fitting industry. This fitting meets NSF 61G certification, confirming it is safe for use in potable drinking water systems. It also conforms to multiple ASME standards including B16.15, B16.18, B16.22, B16.24, B16.50, and B1.20.1, ensuring dimensional accuracy and material compliance. The fitting weighs 0.40 pounds, making it easy to handle on the job. Whether you are roughing in new supply lines, replacing a damaged adapter, or retrofitting existing copper plumbing to threaded connections, the Mueller Streamline W01571 provides a code-compliant, reliable solution.

• Wrot copper construction for superior strength and corrosion resistance in pressurized water systems
• FTG male solder inlet by FPT female NPT thread outlet, both sized at 1-1/4 inches
• NSF 61G certified and compliant with ASME B16.15, B16.18, B16.22, B16.24, B16.50, and B1.20.1

Product Highlights

The Mueller Streamline W01571 delivers a code-compliant, potable-water-rated transition from a soldered copper line to a female NPT threaded connection in a 1-1/4 inch size, built to the dimensional and material standards plumbing professionals trust on every job.

Product Information

Standard Information

• Brand: MUELLER STREAMLINE
• Manufacturer Part Number: W01571

Technical Specifications

• Material: Wrot Copper
• End Type: FTG - Fitting, Male Solder
• End Size: 1-1/4 inches
• Second End Type: FPT - Female Pipe Tapered Thread, NPT
• Second End Size: 1-1/4 inches
• Weight: 0.40 pounds
• Standards: NSF 61G, ASME B16.15, ASME B16.18, ASME B16.22, ASME B16.24, ASME B16.50, ASME B1.20.1