Quick disconnect fittings let you make and break a fluid connection with one hand, in seconds, without tools. They're widely used in situations where a line gets connected and disconnected regularly, such as dispensing setups, pneumatic tool lines, fluid systems, and anywhere else where time spent reconnecting hoses is time wasted.
How They Work
A Quick Disconnect coupling has two halves: a male body and a female body. The female half has a spring-loaded sleeve, and when you push the male half in, internal balls or clips snap into a groove in the male body, locking the two together. To disconnect, pull back the sleeve while pulling the halves apart.
Male QD, Female QD, and Solid Plugs
Male and female in Quick Disconnect terminology refer to which half connects to which. The male body is the part with the stem that inserts into the female housing, and solid plugs are male-profile inserts with no through-hole that cap the female coupler to protect it from contamination when not in use.
Back Ends
Quick Disconnect fittings connect to your system through their back-end thread, barb, camlock, etc. Common back ends include male NPT, female NPT, garden hose thread, and barb, and the back end is independent of the QD mechanism so you choose whatever suits how you're connecting the fitting into your line.