Delta 3 Reed Valve System A larger flow potential provides better acceleration and more horsepower throughout the powerband. Crisp throttle response out of the corners. Composite material with rubber overmold reed cages provide longer reed life. 12-petal design with carbon fiber reed petals. Order one reed-petal set per reed block. The best parts at the lowest prices. Delta 3 Reed Valve System. A larger flow potential provides better acceleration and more horsepower throughout the powerband.