NIBCO Sweat Fitting Adapter: 1 1/2 in CTS x 1 1/4 in Pipe, Cup x FNPT, Wrot Copper (MPN 603-R)
SKU 3G-OTH-472513
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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 cup end solders onto 1 1/2 in CTS copper tube, while the FNPT end threads onto 1 1/4 in pipe, enabling a reliable transition between joining methods.
What are the specifications of the NIBCO 603-R sweat fitting adapter?
The NIBCO 603-R is a wrot copper sweat fitting adapter with a cup x FNPT connection. It fits 1 1/2 in CTS copper tube on the cup side and 1 1/4 in pipe on the female NPT side. The manufacturer part number is 603-R.
Where to buy NIBCO sweat fitting adapters worldwide?
3G Electric supplies NIBCO sweat fitting adapters worldwide. As a global industrial solutions provider, we handle full logistics and customs clearance to deliver genuine NIBCO fittings to your facility. Contact us for pricing and lead time on the 603-R model.
How to install a NIBCO sweat fitting adapter?
To install a NIBCO sweat fitting adapter, clean and flux the copper tube end, then insert it into the cup. Heat the cup evenly with a torch until solder flows, then allow to cool. For the threaded end, apply pipe sealant and tighten to the female NPT connection.
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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.









