NIBCO Sweat Fitting Adapter: 3/8 in CTS x 3/8 in Pipe, Cup x FNPT, Wrot Copper (MPN 603-3/8)
SKU 3G-OTH-472670
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Frequently Asked Questions
What is NIBCO 603-3/8 sweat fitting adapter used for?
This NIBCO wrot copper adapter connects 3/8 in CTS copper tube to 3/8 in female NPT threaded pipe. It is used in plumbing, HVAC, and industrial piping systems for transitioning between sweat (solder) and threaded connections.
What are the specifications of NIBCO 603-3/8 sweat fitting adapter?
The NIBCO 603-3/8 is a cup x FNPT adapter made of wrot copper. It has a 3/8 in CTS sweat inlet and a 3/8 in female NPT threaded outlet. The manufacturer part number is 603-3/8.
Where to buy NIBCO 603-3/8 sweat fitting adapter worldwide?
3G Electric supplies the NIBCO 603-3/8 sweat fitting adapter 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 fitting.
How to install NIBCO 603-3/8 sweat fitting adapter?
Clean and flux the copper tube and cup end, then solder using lead-free solder per local codes. For the FNPT end, apply thread sealant and tighten to standard torque. Always follow NIBCO installation guidelines for wrot copper fittings.
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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.









