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This 80mm high Wallbarn Standard Black Plastic Cap is for use with TPE Vents. Sometimes referred to as aerators, Wallbarn TPE Vents are designed to aerate concrete slabs and help the structure breathe. Manufactured from TPE, a plastic/rubber compound, they are suitable for bituminous waterproofing systems.Once waterproofed, it is essential moisture has a way to escape to avoid bulging of the material, which could lead to bubbling, blistering or even the bursting of the waterproof material.Features & Benefits: Wallbarn Standard Black Plastic Cap for TPE Vents - 80mm High, For TPE vents, Easy to use, 80mm height, 106mm diameter at the top, 110mm diameter at the bottom (where it slots into the pipe), Made from plasticThe vent is placed onto the bare concrete beneath the waterproofing membrane and insulation to draw moisture away. When the membrane is applied over the vent base, it creates a flue that helps draw the vapour out of the concrete.Featuring a series of ribs along the underside of the round base plate (or flange), they help to encourage vapour movement along the base and into the tube (or flue).. Wallbarn Standard Plastic Cap for TPE Vents - Black