NIBCO Sweat Fitting Adapter: 1 1/4 in CTS x 1 1/4 in Pipe, Cup x FNPT

A NIBCO sweat fitting adapter connects copper tubing to threaded pipe in plumbing and HVAC systems. The cup end solders onto 1 1/4 in CTS copper tube, while the FNPT end accepts a 1 1/4 in male threaded pipe, enabling reliable transitions in water supply and hydronic heating lines.

The NIBCO 603-11/4 is a wrot copper adapter with a cup x FNPT connection. It fits 1 1/4 in CTS copper tube on the cup side and 1 1/4 in pipe on the FNPT side. The manufacturer part number is 603-11/4, and it is designed for sweat (solder) installation.

3G Electric supplies NIBCO sweat fitting adapters worldwide. As a global industrial solutions provider, we handle full logistics, customs clearance, and delivery to your site. Contact us to source the NIBCO 603-11/4 or other wrot copper fittings for your project.

To install a NIBCO sweat fitting adapter, clean and flux the cup end and the copper tube. Heat the joint evenly with a torch until solder melts into the gap, then allow it to cool. For the FNPT end, apply thread sealant and tighten onto a male threaded pipe. Follow local plumbing codes.