Material: Plastic Click system, 2 pcs Delivery includes fastening material and seals. Suitable for all vehicle types. Application area: Vehicle ventilation Advice: In accordance with GGVS 21212, DVS 0211, the following applies: When transporting compressed gas bottles in enclosed motor vehicles, 2 non-sealable openings are mandatory, and the installation must be as diagonal as possible. There must be a free ventilation cross-section of at least 100 cm² around each opening.