ActronAir Discharge Muffler 1/2" Solder Steel (R410A) reduces compressor discharge pulsation on compatible R410A ActronAir split ducted systems, attenuating pressure oscillations in the discharge line to reduce noise transmitted through the outdoor unit structure and refrigerant pipework. The 1/2 inch solder connection distinguishes this R410A-service muffler from similarly-sized R22 variants -- confirm refrigerant type before ordering. Isolate power and recover all refrigerant before replacing any discharge line components.