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Reference.org
Quick connect fitting
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<p>For <a href="/facts/Hose/MI0nnHbY">hoses</a> and <a href="/facts/Piping/Y8UEQBXx">piping</a>, a quick connect fitting, also called a push fitting or Quick Connect Coupling, is a coupling used to provide a fast, make-or-break connection of gas or liquid transfer lines. Operated by hand, quick connect fittings replace threaded or <a href="/facts/F_37_(Flange_connection)/ukwCfs3b">flanged connections</a>, which require wrenches. When equipped with self-sealing valves, quick connect fittings will, upon disconnection, automatically contain any fluid in the line. However, this depends on the type of coupling, such as single shut-off, double shut-off, or straight-through designs, which determine whether fluid retention occurs. </p>