Aluminum Cam & Groove Coupler, Female Half, 3 Inch Female NPT

Absolutely not. Under no circumstances should you use cam and groove couplings for compressed air or steam service. They are strictly meant for handling liquids.

Female NPT on your line means you'll want a female cam and groove coupler on the coupler side, and that's exactly what this one is. The 3-inch female NPT thread connects directly to your existing NPT fitting. Coupling and uncoupling is all hand pressure, press the cam levers down to lock in, lift the arms to release. The cast-in lugs also let you run a safety pin through once it's coupled, so it won't back off on you mid-transfer.