Dolphin Adapter 3-1/2" x 63mm threads.

A Dolphin™ Adapter is required to connect your Dolphin™ Bucket to the COD end of your plankton net.  Choose dolphin™ adapters based on the cod end size of net. Larger cod ends take larger adapters. Use this adapter for nets with a cod end of 3-1/2". Compatible with 200 & 300 mL Dolphin Buckets as well as 200 mL Wisconsin Buckets.