If you’re looking for a durable, tamper-proof well cap that will withstand repeated use (and abuse) over many years, the EcoPlug? is an excellent fit for your requirements. This well cap is available for 3/4″, 1″, 2″ and 4″ monitoring wells. The EcoPlug? offers affordability with a more conventional design, but includes the largest sealing gasket of any well cap available.