Blue Sea Systems Water Resistant Contura Switches, come with a gasket, and are specially manufactured for mounting in Blue Sea Systems Contura Water Resistant Panels.
These switches can also be mounted in a regular Contura Switch panel (such as a B/S 8268), but note that the standard panels do not have edge gaskets, and are not water resistant.

Vibration, shock, thermoshock, moisture, and salt spray resistant
Where applicable, LEDs indicate "ON" position (see Specification Table for details)
Ignition protected - safe for installation aboard gasoline powered boats
Amperage rating: 20 amps at 12V DC; 15 amps at 24V DC
Mounting hole: 1.45" x 0.83"
Weight: 0.09 lb (1.44 oz)
In the list below ( ) indicates a mometary position

Note that, lacking gaskets, using standard Contura Switches from another manufacturer in a Blue Sea Systems Water Resistant Panel will not maintain the water resistant ingress protection of the Blue Sea Systems Water Resistant Panel.