NPS stands for Nominal Pipe Size. It's a dimensionless number used in North America to indicate the size of pipes, valves, and other related components in a piping system. It's not a direct measurement of the pipe's actual dimensions, but rather a convenient way to refer to a specific pipe size.
Please refer to OD, ID and Wall for actual size of pipe.
Galvanized Steel pipes are hot dipped in a zinc galvanizing process. Galvanized pipes are a lower cost alternative to stainless steel to achieve rust free protection,
Galvanized pipes can be cut, machined or welded by common methods used for regular steel, but adequate ventilation should be used to avoid inhalation of fumes when welding. Ends of our smaller lengths are not galvanized and should be treated with a cold galvanizing compound to maintain protection once your project is complete.

Material: Steel
Shape: Pipe
Alloy: A53
Temper: Annealed
Nominal Pipe Size: 2-1/2 inch Schedule 10
Outside Diameter: 2.875 inch
Inside Diameter: 2.635 inch
Wall: 0.120 inch
Finish: Galvanized
Specifications: ASTM A53, A500B
Tolerances: Industry Standards on OD and Wall| Length: Listed length up to plus 1 inch.