Double Helix Covers by ZHW from china

The more advanced civilization, the more respect
for nature, the nature of learning

The double helix helix structure covers the
design inspiration from the nature of the most
ubiquitous,The whole model uses double helix,
flat screw and the lower screw connection into a
solid whole,Flat screw is not only to ensure the
safety of pedestrians through, and will not like
cross structure easy to plug.Spiral structure to
ensure smooth drainage. Provide support for the
lower helix, but also to guide the formation of a
whirlpool of water,Accelerating strong drainage.

The safety cover does not need special guard
waterlogging. Do not open the covers can
automatically and quickly drain,
Reduce waterlogging hazard.