Safety Excess Flow Check Valve or "Velocity Fuse" for compressed air.
How big is the line?  Malema (spelling uncertain) sells a bit larger.  Verify the line size and max flow rate for additional help.
The hose Dia. is 3/4".
Circle Seal uses the term fuse valve.  Malema valves have a manual reset.
REGO excess flow check valves are also used.
The more you learn, the less you are certain of.

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