NIBCO Sweat Fitting Adapter: 3/4 in CTS x 3/4 in Pipe, Cup x FNPT, Wrot Copper (MPN 603-3/4)

A NIBCO sweat fitting adapter connects copper tubing to threaded pipe in plumbing and HVAC systems. The 3/4 in CTS cup end solders onto copper tube, while the FNPT end accepts a male threaded pipe, enabling reliable transitions in water supply and hydronic heating lines.

The NIBCO 603-3/4 is a wrot copper adapter with a 3/4 in CTS cup x 3/4 in FNPT connection. It is designed for sweat (solder) installation and meets standard plumbing requirements for copper tube fittings. The cup end fits 3/4 in copper tube, and the female thread accepts 3/4 in male pipe.

3G Electric supplies NIBCO sweat fitting adapters like the 603-3/4 to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for pricing and lead time on this wrot copper adapter for your plumbing or HVAC project.

To install a NIBCO sweat fitting adapter, clean the copper tube end and the cup interior with emery cloth, apply flux, insert the tube fully into the cup, and heat evenly with a torch until solder flows into the joint. Allow to cool naturally. For the FNPT end, use thread sealant and tighten to standard torque.