The 71704021 Hobie kayak storage tank fits perfectly into the interior of the 8 Twist and Seal hatch, with this storage accessory you will have easy access to the small items you need to carry inside the helmet.With a 5 depth it has a much deeper profile than different standard-sized tanks, this allows more options and storage space.It adapts perfectly to most Hobie kayaks, with the exception of the Pro Angler and Quest kayak.FEATURESAdd storage with easy access for smaller itemsSpecially designed to fit into 8 Twist and Seal hatchesYour interior offers enough space for your needs5 deep for more storageDoes not fit the Pro Angler or Quest