Storz hose couplings are comprised of interlocking hooks and flanges, and are sometimes referred to as sexless couplings because rather than having male and female ends that connect by screw threads, Storz connectors have identical ends that can be joined to any other end of the same size.
Storz Blind Caps are hard anodyzed aluminum, with the cap connected to the adapter with a 0.125" vinyl coated aircraft cable. A suction gasket helps keep a tight seal for vacuum. This high-torque cap requires a Storz spanner wrench for removal.