Drennan's Pull-Bung allow you to effectively setup your chosen elastic extra soft for silverfish and small carp without fear of bumping them. If something bigger than average comes along, you can ship back to the relevant section containing the Pull Bung. Then gradually start to pull elastic out of the tube with your free hand, usually trapping this with the fingers of the hand holding the top kit. This effectively tightens the elastic, gradually exerting more pressure on the fish. Enabling you to comfortably land those bigger fish.
The Pullbung is made in a relatively pliable plastic so that it is easy to cut without splitting or cracking. It also comes complete with super slick internal bushes top and bottom to reduce wear and protect the elastic and is probably best used with stronger dedicated ‘carp’ type poles designed for use with more thicker more powerful elastics.