Plastic 1 1/2" Red Fire Nozzle With Bumper (NH) Female Threads_NPT 5 inch NH / NST

5 inch NH / NST which is very common

878 inches

Forestry Type II Spec Sheet

The male threaded side of this adapter will only connect to a 6 inch female National Pipe Tapered (NPT) or National Pipe Straight Hose (NPSH) thread

however there are "local" exceptions

Plastic 1 1/2" Red Fire Nozzle With Bumper (NH) Female Threads_NPT 5 inch NH / NSTRed 1 1 2 inch combination nozzle has the option for either a fog pattern, straight stream or off. It is made out of polycarbonate with a brass stem in the middle. National Hose (NH) aka National Standard Thread (NST) is often referred to as fire hose thread as this is by far the most common thread in use today by fire departments. How we conducted our nozzle testing We used a Honda self priming water pump with a two inch inlet and a two inch outlet