The BEKO 4008541 is an OEM red lock slide bar used on their inline compressed air filters. This fits their S040 through M012 series filters.
The red slide bar lock secures the filter canister to the housing head. This prevents someone from opening the canister when pressurized. Two o-rings seal the inside of the slide bar preventing air from leaking when it's in the locked position.
Part #: 4008540
Part #: 4010931
Part #: 4023608
Part #: 4025536