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Increase the speed of the cylinder With / without silencer Connection - M5, G1/8, G1/4, G3/8, G1/2 Type GQ01 series is with silencer to reduce the exhaust noise  Functions : These Quick exhaust valves when fitted to cylinder ports will result in increased speed of the cylinder. The exhaust air is directly connected to atmosphere through a bigger hole, instead of exhaust air going through the directional valve