Norgren T20 Screw-In Exhaust Flow Regulators/Silencers - Norgren T20C1800, This unit functions as both an exhaust flow regulator and as a silencer. The regulator/silencer has a compact design and is mounted directly in the exhaust port. Norgren T20C1800 Screw-In Exhaust Flow Regulator/Silencer G1/8 Port
