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Streamline® Copper Solder-Joint Fittings for supply/pressurized systems have been the leading brand of copper fittings for decades. Available in both wrot copper and cast bronze, our product selection has grown to become the most extensive in the industry. We are the acknowledged experts at engineering and manufacturing precision solder-joint copper fittings. Quality, consistency and reliability have made the Streamline® brand trusted and specified all around the world.


Streamline® Wrot Copper Pressure and DWV fittings for use in plumbing or mechanical applications. Available sizes ranging from ¼” to 8” in diameter – Streamline® Wrot Copper fittings for use in refrigeration applications. Available sizes ranging from ¼” to 8-1/8” in outside diameter.


For use in above/below ground potable water systems as well as heating, ventilation, air conditioning, & refrigeration


Streamline® Wrot Copper fittings shall be made from material in compliance with ASTM B75 and of UNS C12200 grade of copper.


The testing and third-party certification validates performance of these products up to operating pressures of 700PSI at 250°F for select sizes (HVAC)

Approvals & Certifications

ASME standards B16.15, B16.18, B16.22, B16.24, B16.50, B1.20.1, NSF 61G (WROT)


125-150 lb. Two-Piece Companion FlangeDownload
300 lb. Two-Piece Companion FlangeDownload
Cleaned & Bagged Copper Fittings for Medical Gas Applications – SubmittalDownload
Copper Fittings for HVACR Applications – SubmittalDownload
Copper Fittings for Plumbing and Mechanical Applications – SubmittalDownload
Copper Fittings StandardsDownload
Copper Fittings Standards (Oxy Med)Download
Lead-Free Compliance – Copper Tube and FittingsDownload
Statement of UL Recognized 48 Bar RatingDownload
Statement of UL Recognized 700PSI RatingDownload
Streamline HVACR Wholesale CatalogDownload
Streamline Plumbing Wholesale CatalogDownload
Streamline Solder-Joint Copper FittingsDownload

Exclusive Technology

As sole producer of copper tube and fittings in the United States, Mueller Industries produces the highest quality copper products in the industry.


DuraGrain™ ensures uniformity and durability of material—providing the highest level of strength and precision

  • Raw copper is refined to a purity of 99.9%

  • Advanced metallurgy results in an optimum grain structure

  • Continuous testing for quality and consistency


TrueCenter™ technology creates consistent grain quality and wall thickness—providing longevity of product

  • Patented laser-guided system