Enviro Design Products is an innovator offering a full line of products for the environmental drilling and monitoring well industry, including the Grip-N-Lock locking well cap. The Grip-N-Lock is a female Nylon locking cap hammered in place either above grade or below grade. It's held secure by 10 internal watertight concentric rings, and the square UV protective gasket creates a watertight compression seal. The cap, only three-inches tall when installed, is recommended by several state and county regulatory agencies. Other products to help those in the field include sewer caps, expansion plugs, sanitary seals, manholes, vaults and meter boxes. For details, visit www.envirodesignproducts.com.