ActronAir Discharge Muffler 1/2 inch solder Solder reduces compressor discharge pulsation on compatible R22 ActronAir residential split ducted systems, dampening pressure oscillations in the discharge line before they propagate as noise through the refrigerant pipework. A cracked discharge muffler transmits full compressor pulsation through the discharge line, increasing noise levels and accelerating fatigue at downstream brazed joints. Isolate power and recover all refrigerant before replacing any discharge line components.