How to Identify and Measure Fittings
Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.
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Twist-Claw Hose Couplings for Air and Water

Also known as Chicago and universal couplings, these have an identical claw-style head that allows you to connect to another Chicago twist-claw hose coupling, regardless of the pipe size or barbed hose ID. To connect, push two couplings together with a quarter twist. Couplings have a safety clip and lanyard to prevent accidental disconnection.
Wye couplings are also known as three-way hose couplings. Use them to connect one inlet to two outlets.
Iron couplings are stronger and more durable than other metal couplings. Use in noncorrosive environments. Warning: There is no valve in these couplings. Stop the flow of air and water before you disconnect the line.
For technical drawings and 3-D models, click on a part number.