Exhaust air flow non-return valve with swivel piece brass design nickel-plated with push-in connector including knurled screw and lock nut

Exhaust air flow non-return valve with swivel piece brass design nickel-plated with push-in connector including knurled screw and lock nut
Exhaust air flow non-return valve with swivel piece brass design nickel-plated with push-in connector including knurled screw and lock nut