The Model 51111 has all the unique features of the BICKFORD 51110 with an addition of one "E" cylinder yoke. This superb design allows the veterinarian to deliver anesthesia where a connection to a main O2system is not accessible or provides a backup source of O2 when connected to a main O2 system. Design Features: ? Quick release toggle latches for easy to change absorbent (prepack or loose granules). ? Pressure manometer ? Air intake valve ? Pop off valve (see through, easy to clean). ? Horizontal inhalation and exhalation valves to prevent valves from sticking in the open position. ? O2 flowmeter 0.2 L to 5 LPM. ? O2 flush ? Compact, very mobile ? Absorber pole allows absorber to adjust up or down and also swings out of the way when not in use. ? Stand provides excellent stability ? Quick & easy switch over from rebreathing to non rebreathing system. ALL STAND MODELS COME TO YOU: COMPLETELY ASSEMBLED - 5 YEAR WARRANTY* WITH 2 LITER BAG WITH 3 LITER BAG PEDIATRIC BREATHING CIRCUIT F/AIR KIT SCAVENGING SYSTEM *Note: 5 yr. warranty does not include rubber goods or plastic tubing. *Bickford Anesthesia Machines are warranted by A.M. Bickford, Inc. to be free from defects in parts or workmanship for a period of five years after delivery when used in normal service. Any Bickford Anesthesia Machine which proves defective in workmanship or parts will be repaired, replaced, or credited at the option of A.M. Bickford, Inc. during the warranty period at no cost provided the unit is returned to A.M. Bickford, Inc.