Polypipe PVC Underground Drain Plain Bottle Gully 110mm is used to prevent any foul smelling air escaping from the system. It can be used to accept water from kitchens, ground floor bathrooms and similar waste areas. It features a polypropylene grid to prevent leaves and other debris entering the gully but also acts as a rodding point for cleaning. It is an alternative to traditional clay drainage systems. It features a simple seal and snap cap system for strong and durable joints.