Aluminum Cam & Groove Adapter, Male Half, Inch Hose Shank

Cam and groove couplings like this one are not rated for compressed air service, period. Same goes for steam. Liquid applications only. If you're running a pneumatic system, you'll need a different style of coupling altogether.

Anything from half inch up through 4 inch is rated at 150 PSI. Once you get into the 5 inch through 8 inch range, the pressure rating drops to 75 PSI. So yes, the larger sizes do carry a lower rating, which is worth keeping in mind if you're sizing these for a high-flow liquid transfer setup.

Interchangeability is built in for standard sizes. It interchanges with products made to A-A-59326 or DIN 2828. The catch is the 1/2 inch and 8 inch sizes since no standard exists there, so those generally do not interchange with other manufacturers.