Mueller Industries W01055 Coupling

The Mueller Industries W01055 Coupling is a professional-grade wrot copper fitting engineered for high-pressure HVACR and plumbing applications. Designed for a 1-1/4" nominal pipe size, this 1-3/8" OD sweat coupling features a rolled stop (roll-stop) to ensure precise tube insertion and consistent solder flow during the brazing or soldering process. This precision-machined C x C copper coupling is manufactured from high-grade UNS C12200 alloy, meeting strict ASME B16.22 standards for pressure-rated systems.

For contractors working on refrigeration, air conditioning, or potable water systems, the Mueller Streamline W01055 provides a 700 psi pressure rating and exceptional corrosion resistance. The sweat roll-stop coupling design prevents over-insertion of the copper tubing, maintaining a reliable mechanical joint that withstands thermal expansion and vibration. This lead-free copper fitting is NSF/ANSI 61 certified, making it suitable for modern industrial and residential builds where durability and code compliance are non-negotiable.

Key Benefits

• Precision Rolled Stop: Ensures accurate tube depth to prevent path obstruction and facilitate a uniform copper solder joint.
• High Pressure Rating: Rated for up to 700 psi at 250°F, ideal for refrigerant lines and pressurized fluid transport.
• ASTM and ASME Compliance: Fully compliant with ASME B16.22 and ASTM B75 for professional-grade mechanical integrity.
• Durable Wrot Copper: Constructed from oxygen-free, high-conductivity copper for superior thermal properties and long-term reliability.
• Multi-System Compatibility: Seamlessly joins 1-3/8" OD copper tubing in HVACR, hydronic heating, and domestic water applications.

Common Questions

Is the Mueller W01055 suitable for R-410A refrigerant lines?
Yes, the 700 psi pressure rating at standard operating temperatures makes this wrot copper coupling suitable for typical high-pressure refrigerant environments found in modern split systems and VRF units.

What is the difference between 1-3/8" OD and 1-1/4" ID for this fitting?
In the HVACR industry, tubing is sized by its outside diameter (OD), which is 1-3/8". In plumbing, this corresponds to a 1-1/4" nominal (ID) pipe size. This fitting accommodates both designations for 1-1/4" type L or M copper.

Can this coupling be used for underground installations?
Standard Mueller Streamline wrot copper fittings are suitable for above-ground and below-ground use; however, ensure local codes are followed regarding protective wrapping for direct burial in corrosive soils.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.