Abstract: In order to provide a water-float coupling device which, even when floats on the water are moved relative to one another, for instance, by waves, prevents the floats from being unintentionally disconnected from one another, a water-float coupling device according to the present invention comprises: tightening member 15 for maintaining, when a locking part 11 is engaged with fastening member 9 to connect a plurality of floats 2 to one another, the locking part 11 engaged with the fastening member 9.

Abstract: Exhaust means for internal combustion engines which comprises an exhaust pipe having one end connected with exhaust port of the engine, said exhaust pipe having an enlarged expansion chamber adjacent to the other end thereof, said exhaust pipe being closed at the other end and provided with an exhaust gas outlet port which is located at a position where the maximum value of noise producing pulsating pressure is relatively low, there being a first portion of substantially uniform cross-section connecting the engine to the enlarged expansion chamber.