NIBCO Sweat Fitting Adapter: 1/8 in CTS x 1/8 in Pipe, Cup x FNPT, Wrot Copper (MPN 603-1/8)
SKU 3G-OTH-472194
Need installation or engineering help?
Ask a question
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 1/8 in CTS cup end solders onto copper tube, while the FNPT end accepts male threaded fittings, enabling reliable transitions in water, gas, or hydronic lines.
What are the specifications of the NIBCO 603-1/8 sweat adapter?
The NIBCO 603-1/8 is a wrot copper sweat fitting adapter with a 1/8 in CTS cup x 1/8 in FNPT connection. It is designed for soldering onto copper tube and accepts male threaded pipe. The cup x FNPT configuration suits low-pressure plumbing and heating applications.
Where to buy NIBCO sweat fittings in worldwide?
3G Electric supplies NIBCO sweat fittings like the 603-1/8 adapter to customers worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact our team for a quote and lead time on this wrot copper fitting for your plumbing or HVAC project.
How to install a NIBCO sweat fitting adapter?
To install a NIBCO sweat fitting adapter, clean the copper tube end and fitting cup with emery cloth, apply flux, assemble, and heat with a torch until solder flows into the joint. For the FNPT end, use thread sealant and tighten to standard torque. Always follow local plumbing codes.
Used in
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.









