Do not compromises & fly with clunk tanks tested in practical applications of very high quality. The tanks have lateral hollow slots, in order to direct for example: connecting rods for carburettor control smoothly at the tank. The tank neck was provided in addition with a brass ring, so that with the tightening of the sealing sleeve a bursting is prevented. A heavy suction cone provides a bubble free suction of the petrol in each position of flight.