Entrance closer/reducer - plastic - Lyson
This is designed to suit an 10 frame langstroth wide entrance but some people have adjusted the length to suit the 8 frame entrances.
Made from UV protected plastic and can be used to either
Completely block the hive entrance or reduce the size of the entrance
Ventilate the entrance when closed.
Does not come with screws.
See the picture sequence below to understand the various positions.