Tackleuk Preston Innovations Pulla Bung 

Manufactured from a lightweight plastic the pulla bung enables you to pull your elastic tighter after unshipping your top kit. The advantage is that you can use lighter elatics for small carp, but tighten it for netting if you hook a bonus fish. This means you dont need to play and net big carp on your top 5s or 6s, which leads to better control, faster netting and less pole breakages.
Preston Innovations Pulla Bung is available from:
www.tackleuk.co.uk