joker valve in a manually pumped toilet, such as used e.g. in boats and campers, a rubber part placed into the exit pipe that prevents backflow from the septic tank while allowing the content of the bowl to flow into the tank
joker valve in a manually pumped toilet, such as used e.g. in boats and campers, a rubber part placed into the exit pipe that prevents backflow from the septic tank while allowing the content of the bowl to flow into the tank