The frame for keeping chainpots open. Choose types depending on cell numbers.
It has claws on each end so that it can hook the chainpots, keeping the honeycomb open during seeding process. The position of claws are different depending on the number of cells.
Opening frame is for chainpots only. For non-chain paperpots, the opening clips are required.
Common cell number>>
CP303/LP303-10/LP303-15: 264 cells
LP353-30: 190 cells