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Side view of a 1.5 to 2.5 inches (38 to 64 mm) adapter. National Hose thread (NH), also known as National Standard Thread (NST). It is the most common type of fire hose coupling used in the United States. The male and female straight (non-tapered) threads screw together and the connection is sealed with a gasket.
A union also connects two pipes but is quite different from a coupling, as it allows future disconnection of the pipes for maintenance. In contrast to a coupling requiring solvent welding , soldering , or rotation (for threaded couplings), a union allows easy connection and disconnection multiple times if needed.
5-inch hose with 5-inch Storz (125 mm) couplings (allowed by NFPA 1963) 6-inch hose with 6-4 NH NFPA threads (NFPA 1963 requirement, but not commonly used in the U.S.) 8-inch hose with 8-4 NH NFPA threads (NFPA 1963 requirement, but not commonly used in the U.S.; only added to NFPA 1963 in the 2003 edition [11]) Non-standard hose couplings
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The bolt is assembled through the center of the union, usually with face seals on either side of the union, to create a fluid path between the external ports on the union and bolt. A flexible hose or a rigid pipe may be connected to the union port. [1] The main advantage of the fitting is in high pressure applications (i.e. more than 50 bar).