Amazon.com: Mtsooning 10PCS Air Pneumatic Flow Control Mufflers, 1/4inch Exhaust Muffler Filters, Bronze Thread Hex Brass Silencer Replacement for 1/4" NPT BSL-02 : Industrial & Scientific
SMC Poly exhaust silencer - 3/8 Inch
Milton Pneumatic Exhaust Muffler, 3/4” MNPT 40 Micron Sintered Bronze Silencer/Diffuse air and Noise Reducer in the Air Compressor Accessories department at Lowes.com