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Quick Connect Coupling

Hydraulic Check Valve

Pneumatic Couplings

Air Quick Coupling

Various Types of Quick Coupling [2010-11-22]

Machine systems use couplings for quick disconnect coupling and reconnections. A coupling is different than a fitting as fittings are attached to the end of tubes and hoses. Couplings can attach these lines but also mechanical, electrical, hydraulic or other type of part. A couplings are preferred over standard fasteners such as nuts and bolts or screws so a mechanic or service technician can quickly remove a part and either repair the item or install a replacement. Couplings can come in a variety of materials such as metal or plastic and have three coupling mechanisms: thread connected hydraulic coupling
, compression or quick-lock.