The cover is made of recyclable composite polymer materials. The unit is designed in accordance with the European Standards EN-124; class D 400. The manhole cover withstands static loading of up to 40 Tonnes. The size to weight ratio is exceptional. The double channel design ensures a hermetic seal for liquids and gas-fumes. A 4 point locking system prevents unauthorized easy access. With a manhole lifter the cover weighs 9 kg.