This 100mm wide (4") undrilled gully lid is for use with the SureGrow Gully. The convex 'Snap-On' lid ensures against rain and weather damage that can occur when using this system outside. It also allows for easy access for cleaning. The lid can be supplied undrilled or drilled. The SureGrow Gully is available in three different sizes that accommodates all facets of hydroponic growing. HydroGarden's leading NFT trough system has proved successful across the world - in places such as Australia and Kuwait.