This nifty accessory for A Line, C Line, and Superlight (any post 2017 Brompton) will prevent your folded Brompton from opening when the seat post is midway, similar to the P Line. Now everyone can enjoy the convenience of a more ergonomic way of pushing your Brompton like the P Line. More convenient than using velcros to prevent unfolding.

• Simple clip on installation, no tools required. 
• Simple unclip to remove, no tools required.
• Works on Brompton's with or without mudguards.
• Still able to retract the seat post all the way down if needed to.
• Designed to work with stock seat post.