Mufflers(Silencers) are widely used on valves,pneumatic cylinders, or any pneumatic systems need a silencer to clean the exhaust air and reduce down the noise and some can adjust the flow rate.Pneutec Pneumatics & hydraulics manufacturer different kinds of mufflers for different conditions.The brass mufflers are most popular,while the plastic mufflers and stainless steel silencers are used in more special conditions.Pneutec Pneumatics & hydraulics mufflers are normally from 1/8" to 1",but some types has bigger size from M5 to 2". We also manfacturer very special muffers according to customers request.For any of these special mufflers,just contact us at any time so that we can develop the exact mufflers as you want.