NNI Fire Hose Hydrant Pin Lug Adapter 2-1/2" Female NST x 2-1/2" Male NPT

Description

NNI Fire Hose Hydrant Brass Pin Lug Adapter
2-1/2" NST - NH (Female) x 2-1/2" Male NPT
“NH”, or National Hose, thread is the thread that has become the standard thread used in firefighting
. The threads specified in NFPA 1963 are “NH”. This thread was previously known as “NST” or
National Standa
rd Thread.
“NPSH”, or National Pipe Straight Hose, is slightly smaller in diameter and
has more threads per inch than the same nominal diameter “NH” thread. “NPSH” thread is sometimes
referred to as “IPT”, or Iron Pipe Thread.
“NH” and “NPSH” threads are n
ot interchangeable. “NH” and
“NPSH” threads are straight threads and require a gasket for sealing between mating threads.
“NPT”,
or National Pipe Tapered, is the thread most commonly found in plumbing applications. Being tapered,
the seal between mating th
reads is made by squeezing the threads together.