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Quick Connect Coupling

Hydraulic Check Valve

Pneumatic Couplings

Air Quick Coupling

Pneumatic Quick-Coupler Styles [2011-01-21]

Couplers can be utilized in a wide range of temperature and pressure scenarios and are made up of two halves that fit together--a male, or plug, half; and a female, or coupler, half.

There are many different types and sizes of couplers that can be routinely used in tools utilizing a central pressure supply system, such as air hoses.
Male and Female NPT
Male and Female National Pipe   Quick   coupler  Threads (NPT) are couplers that are used to connect pipes on hydraulic systems, according to the Cole Parmer Technical Library's website. These NPTs can be divided into two types: jointing threads and fastening threads.
Male and Female Straight Threads
Male and Female Straight Threads are used to connect two tubes Quick   coupler  , usually on hydraulic systems, according to the Tool Lingu website; they are joined by an O-ring.