Square grid for square and rectangular hoppers of 110mm underground drainage systems. Allows water to pass, but prevents entry of leaves and airborne debris. Made from durable polypropylene to provide high impact resistance, and can be cut to allow entry of waste pipes. Pipe should be chamfered and lubricated with silicone spray or grease prior to fitting, to ensure the best seal. Insert pipe to central stop and pull back 10mm to provide room for ground movement. Part of our range of durable and impact resistant fittings for 110mm plastic PVC-u underground drainage pipes, the most common residential system. These lightweight, easy-fit parts are compatible with all systems manufactured to BS EN 1401 or BS EN 13476-2. Pipe and bend fittings are available with pre-chamfered plain or socketed ends, which feature a ring seal for easy and secure connection to different parts of the system. These fittings can be used in conjunction with new or existing inspection chambers, or soakaway crates, to complete the underground drainage system. Features: Durable and impact resistant, Lightweight and easy-fit system, Captive push-fit ring seal system, Smooth inner walls for better flow, Tested to BS EN 1401-1 : 1998.