Black acoustic vent. The 200kPa equates to 20Mtr depth, although we usually recommend 50% of this figure as a safety precaution. The vent is circular and has an acrylic adhesive ring to secure it to your device. The vent is best installed on the inside wall of a sealed device. Vents have a shelf life due to the adhesives, the shelf life is 6 months. This is just the time stored in your stores, it does not represent the life span of the part on your product. There are a range of defaults sizes, custom sizes/shapes are also available. Other acoustic vents are available - such as our SEL-3276, which offers improved acoustic performance, but it is only available up to 10mm in OD.