Don’t worry, you’ll still have access to your sewage drain. Simply place the AirSkirts tube under the drain area and slowly inflate – the tube will inflate to conform around the irregular areas. Our buffer pillows can fill in any gaps. Because the skirts are modular, you can place them so the ends of the tubes meet at any odd protrusions. You can also consult with one of our engineers after placing your order to discuss any concerns. We can make a few tube swaps at no charge but if you need a fully custom setup, you’ll need to purchase one of our customized kits.