Prevent accidental disconnection with these couplings—they come with a safety clip and lanyard, and have a spring-loaded locking sleeve that automatically locks into place when you connect the coupling. Also known as Chicago and universal couplings, they have an identical claw-style head that allows you to connect to any other spring-lock twist-claw hose coupling. To connect, push two couplings together with a quarter twist. To disconnect, slide the locking sleeves back and twist the couplings apart. Couplings are iron, which is strong and durable. Use in noncorrosive environments.

Couplings with a barbed end insert into rubber hose and secure with a clamp.

Warning: There is no valve in these couplings. Stop the flow of air and water before you disconnect the line.

Also known as universal couplings, these have an identical claw-style head that allows you to connect to any other extra-large twist-claw hose coupling. To connect, push two couplings together with a quarter twist. Couplings include a safety clip to prevent accidental disconnection. They are made of iron, which is strong and durable, and have a black painted finish for fair corrosion resistance. Use in noncorrosive environments.

Warning: There is no valve in these couplings. Stop the flow of air and water before you disconnect the line.

Also known as universal couplings, these have an identical claw-style head that allows you to connect to any other large twist-claw hose coupling, regardless of the pipe size. To connect, push two couplings together with a quarter twist. Couplings include a safety clip to prevent accidental disconnection. They are made of iron, which is strong and durable, and have a black painted finish for fair corrosion resistance. Use in noncorrosive environments.

Warning: There is no valve in these couplings. Stop the flow of air and water before you disconnect the line.

Also known as ground-joint couplings and boss couplings, these fittings are designed for high-pressure steam heating, humidification, and washdown applications. Insert the barbed end of the fitting into rubber hose, then position the interlocking clamp over the hose and bolt into place with a torque wrench. The clamp firmly grips the hose as it locks into the ring of the barbed end, creating a leak tight seal. The interlocking clamps are not reusable. Fittings are strong and durable with fair corrosion resistance.

Fittings with a female threaded end have a hex bushing (also known as a female spud) that connects to a male interlocking-clamp hose fitting. Replace the hex bushing with a hex nipple (sold separately) to connect two female fittings; the hex nipples are also known as double spuds.

Warning: There is no valve in these couplings. Stop the flow of steam before you disconnect the hose line.