Some systems are noisy due to vibration and pulsation of gas through the discharge line. To smooth out pulsations and reduce vibration and noise, Refrigeration Research offers the industry's most complete line of Discharge Mufflers. Refrigeration Research has long been a leading manufacturer of mufflers in production quantities and was first to offer a complete catalog line. All mufflers are of hydrogen copper brazed steel construction insuring maximum strength and complete cleanliness.