3 BLACK COUP

3" Black Coupling (3 BLACK COUP)

This is a standard threaded pipe coupling used for black steel (black iron) pipe systems.

What it is

A black steel pipe coupling:

• Has female internal NPT threads on both ends
• Connects two 3" male-threaded black steel pipes
• “Black” refers to uncoated black iron steel pipe fittings (no galvanizing)

What it does

• Joins two sections of 3" black steel pipe
• Extends a piping run in a straight line
• Creates a tight, threaded, leak-resistant connection

Key features

• Material: black steel (uncoated carbon steel)
• Connection type: female threaded both ends (NPT)
• Design: straight coupling (same size both ends)
• Used in non-galvanized piping systems

Common applications

• Natural gas and fuel gas piping
• Air lines and mechanical systems
• Fire sprinkler systems (in some configurations)
• Industrial piping and structural systems