Aluminum 1 1/2" Female NH to 1 1/2" Male NPSH Threads_NPSH The most common fire fitting

The most common fire fitting thread in the United States is 2 1/2 inch NH /NST

One 12 oz bottle

Back flush flap is drawn closed during suction operation

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

Aluminum 1 1/2" Female NH to 1 1/2" Male NPSH Threads_NPSH The most common fire fittingUSDA Forestry Service fire hose reducer feature aluminum coupling with a 600 PSI test pressure. Meet Forest Service Spec 5100 107. Female 1 1 2 inch NH, 9 threads per inch and male 1 1 2 inch NPSH, 11 1 2 threads per inch. Meets National Fire Equipment System (NFES #0006). Water Handling Accessories flow rates are 100 PSI flowing pressure. Fire hose reducer female adapters comes with a gasket. This Wildland Fire Equipment adapter or coupling is used