Anti-vandalism cap/ closure of groundwater monitoring wells from 1.5"- 6" pipe diameter. Pecial alloy of cast aluminum for high corrosion and weather resistance even in frosts The SEBA cap made of weather-resistant cast aluminum primarily serves for the closing and protection of groundwater monitoring point. The lid can be opened optionally either with a standard Allen key or with a special SEBA key. The use of SEBA-caps with safety lock is highly recommended to prevent theft and vandalism of the metrological equipment (e.g. data collector for groundwater monitoring) or at least to make it more difficult. The design also allows for quick opening and closing of the cap.