This grey PVC extract cowl from FloPlast is ideal for carrying waste safely and cleanly away from your home. It sits on top of the vent pipe to prevent birds from entering or nesting within the soil pipe, causing a blockage. The vent cowl is open to the air, but has a top cover that prevents rainwater from entering the vent pipe. This fitting is often referred to in the trade as a mushroom cowl because of its distinctive shape.