NIBCO Sweat Fitting Union: 3 in CTS x 3 in CTS, Cup x FTG, Cast Copper (MPN 733 3)
SKU 3G-OTH-469277
Need installation or engineering help?
Ask a question
Frequently Asked Questions
What is a NIBCO sweat fitting union used for?
A NIBCO sweat fitting union connects two copper pipes in plumbing, HVAC, and industrial systems, allowing easy disassembly for maintenance. This 3-inch CTS cast copper union uses a cup x FTG design for soldered joints, ensuring leak-free performance in water, gas, and steam lines.
What are the specifications of the NIBCO 733 3 union?
The NIBCO 733 3 is a 3-inch CTS cast copper sweat fitting union with cup x FTG ends. It is made from cast copper for durability in high-temperature and pressure applications. The manufacturer part number is 733 3, and it is designed for soldered connections in copper tubing systems.
Where to buy a NIBCO 733 3 union worldwide?
3G Electric supplies the NIBCO 733 3 union worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner, we provide this cast copper fitting for industrial plumbing and HVAC projects. Contact us for availability and lead times to your location.
How to install a NIBCO sweat fitting union?
To install a NIBCO sweat fitting union, clean and flux the copper pipe ends and the cup x FTG surfaces. Heat the joint evenly with a torch until solder melts into the gap, then allow it to cool. Ensure the union nut is tightened after soldering for a secure, leak-free connection.
Used in
Common applications for NIBCONIBCO Products
3G Electric supplies NIBCO cast copper & bronze tube fittings. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.









