Thetford 345 Boat Porta Potti The Thetford 345 Boat Porta Potti features a modern, refreshed design with an integrated cover-lock and manual flush piston pump system. This medium sized high capacity waste holding tank has an improved ergonomic carry handle, valve handle system, and improved seating comfort. With a cleaner seat and cover design, integrated pour-out spout and redesigned fill cap pump, this toilet will provide exceptional satisfaction and long lasting use. Features High Capacity W