Female' connector sleeve to connect 'male' parts together. Required between every 'male' accessory Connector sleeve element (female) for combining other male ducting elements Directly integrated sealings for full airtightness without necessity for any duct-tapes. Aerodynamically optimised design to minimise pressure loss and maximise air flow rate. Easy-to-connect via time saving click mechanism. The element complies with the Needle Flame Test (according to IEC 60695-11-5) + the V2 flammability class (according to UL94).