NIBCO Sweat Fitting Adapter: 3/8 in CTS x 3/8 in Pipe, Cup x MNPT, Wrot Copper (MPN 604-3/8)
SKU 3G-OTH-472338
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Frequently Asked Questions
What is a NIBCO sweat fitting adapter used for?
A NIBCO sweat fitting adapter connects copper tubing to threaded pipe in plumbing and HVAC systems. The 3/8 in CTS cup end solders onto copper tube, while the 3/8 in MNPT end threads into female pipe fittings, enabling reliable transitions in potable water and hydronic heating lines.
What are the specifications of the NIBCO 604-3/8 sweat fitting adapter?
The NIBCO 604-3/8 is a wrot copper adapter with a 3/8 in CTS cup x 3/8 in MNPT connection. It features a cup x male NPT configuration, designed for sweat (solder) installation. The wrot copper construction ensures corrosion resistance and durability in plumbing applications.
Where to buy NIBCO sweat fitting adapters worldwide?
3G Electric supplies NIBCO sweat fitting adapters worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner across 14 industrial departments, we provide genuine NIBCO fittings like the 604-3/8 to support plumbing and HVAC projects anywhere.
How to install a NIBCO sweat fitting adapter?
To install a NIBCO sweat fitting adapter, clean the copper tube and fitting cup with emery cloth, apply flux, assemble, and heat with a torch until solder flows into the joint. For the threaded end, use pipe thread sealant and tighten to standard torque. Always follow local plumbing codes.
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Common applications for NIBCONIBCO Products
3G Electric supplies NIBCO wrot copper tube fittings. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.









