The most common thread type in use by fire departments today is NST or National Standard Thread. It is often referred to as “fire hose thread”.
2 Double Jacket Fire Hose - Fire Protection Equipment Supply
Single Jacket Hose vs. Double Jacket Hose
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How is a fire hose connected to a building? - Quora
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Introduction To Fire Hoses
1.5 NPSH Female Swivel x 1.5 NST (NH) Male Hose Adapter –
How does a standard hose coupling for fire hydrants differ from a