Chub sack extension cord the chub sack extension cord has a standard 38 bsf screw fitting at one end and a durable high impact plastic quick releasequick fixing clip especially useful when fishing low oxygenated margins when it is important for the sack to reach deeper oxygenated water fishing accessories 3 metre length sack extension cord 38 bsf screw fitting high impact plastic quick release chubs branding high quality multi 3m