Durable Compact Carbon Steel Construction w/Black Powder Coated Finish Fully Drawn Weather hood No Welds to Rust or Vibrate Apart Patented High Grade Element w/Built In Vacuum Tight Seal, Creates Positive Seal Between Housing Hemispheres New Seal with Each Element Minimizes Parts Tubular Silencing Design - Tube is Positioned to Maximize Attenuation and Air Flow While Maintaining Pressure Drop Used on Campbell Hausfeld, Black & Decker, Quincy, Coleman Power mate Compressors