These silencers are specially made for use on IDP-15 and SH-110 dry scroll pumps and that are not connected to a house exhaust system. They are designed for clean dry air (CDA) vacuum pumping applications where the exhaust is vented into the room. They greatly silence the exhaust of dry pumps. These exhaust silencers are equipment with an NW-16 (KF-16) vacuum flange and are rated for use up to 5 CFM. They come with a KF16 vacuum clamp and centering ring for easy installation.