Polypipe Ring Seal Soil & Vent Weathering Slate Rubber/Aluminium 457x457mm Angled is used to prevent rainwater from passing into the building along the pipe wall. The soil pipe passes through the roof and the slate is pushed over the top to create a water and airtight seal. It needs to be used with a weathering apron to prevent the rainwater from entering. Suitable for using on pitched roofs.