NRS Thwarts for Pennel Orca Rafts Sigma Generic gradient fill icon. Perfect to make extra room in the Otter series boats! Some say three's a crowd, but we like to believe the more the merrier. Make room for even more paddlers in your NRS Pennel Orca material raft by adding another thwart. Adding another thwart provides seating for more paddlers and offers extra flotation for your raft. Built with the same quality materials and craftsmanship as your NRS inflatable boat. Trouble free Leafield C7 Valve guarantees simple, reliable inflation and deflation. Easily install, remove, or adjust the additional, and original, thwarts using the NRS BAT (Batten Attachment Thwart) system.