Stainless Steel Cam & Groove Coupler, Female Half, 1-1/2 Inch Hose Shank

Cast-in lugs on the coupler body are the key. Once you've coupled the adapter and pressed the cam levers down, those lugs line up with slots in the cam lever arms. You slide a safety pin through and that pin physically blocks the levers from lifting. Nothing can uncouple it until you pull the pin out first. Good setup for lines where an accidental disconnect would cause a real mess.

This coupler's made from 316 stainless steel, so it's a good choice for situations where you need resistance to corrosion.