A plastic evacuation tube for use with a standard dental and/or surgical vacuum system is disclosed. The tube is formed with an enlarged non-compressible bulb-shaped portion (bulb) intermediate its length. The operational end section of the tube is tapered from the bulb to a smaller diameter flexible...http://www.google.se/patents/US4182385?utm_source=gb-gplus-sharePatent US4182385 - Vacuum evacuation apparatus
