A nipple is basically a pipe with male threads on each side to facilitate joining two pipes or fittings with similar female threads. It is made by cutting threads on both sides of a pipe by die or a suitable process. The nipples may be short or long.
Hexagonal Reducer Nipple
A hexagonal reducer nipple is a hexagonal shaped nipple with two different sizes of
threads on each side. The purpose of the hexagonal reducer nipple is to connect the pipes of two different sizes together
Hexagonal Nipple
A hexagonal nipple is a pipe connector with male threads on both sides and a hexagonal
nut in between for easy installation and screwing. Both sides are to be screwed in pipe or fitting having reciprocating female threads.
Hexagonal Long Nipple
A hexagonal long nipple is used where the distance between the pipe and the fittings is
to be joined. They are otherwise similar to the hexagonal nipples apart from the length.
Long Pipe Nipple
A long pipe nipple is similar to a standard nipple but longer in length It is used when
there is more distance between the fittings or when a fitting like a valve is to be put at a
distance.
Close Nipple
A close nipple is completely threaded and there is no unthreaded area. This means that
there is no hexagonal nut of plain pipe for putting the wrench. These can be damaged by
using wrenches. Therefore, a special tool called nipple wrench, which holds the nipple
from inside, is used for fitting.