How To Connect To A Fire Hydrant
In most US areas, individuals who need temporary water may purchase permits to use hydrants. The permit will generally require a hydrant meter, a gate valve and sometimes a back-flow preventer.
Most fire hydrants have two 2.5 inch hose connection outlets with 7.5 threads per inch (TPI) and one 4.5 inch-pumper connection outlet with 4 threads per inch. National Hose (NH) or 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.
Here is a list of major U.S. cities using NH / NST threaded fire hydrants - Click Here
Two Ways To Determine Hydrant Size
Individual should contact their local fire department, water services or public works to determine the specifications.
You may also count threads per inch (TPI) and/or measure the outside diameter of the male (ODM) outlet to help determine thread type.
|Size||NH or NST|
|Inside Diameter Male||Outside Diameter of Male||Threads Per Inch|