They significantly reduce the exhaust noise on the pneumatic solenoids. They are of great importance. The only issue I had was that the control valves are extremely sensitive so it takes a bit of fine tuning to get the airflow perfect, but once you've done that you can tighten the jam nut on the valve which will hold it securely in place . . Very good product. Would buy again. I hope this information is useful to anyone who is going to purchase this product.
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