It is accepted as one of the most reliable & effective suction machine. By simply compressing and releasing the bellows, a partial vacuum is produced and transferred over the bottle to the suction tube. A partial vacuum of 210mm of Hg is obtained after a single compression & release of the bellows and after a few more cycles, the maximum of 300mm of Hg is obtained. The rate of pumping required is slow, approximately once every three seconds. In an emergency should the bottle overfill, the pump will continue unaffected. Fluids will be ejected through an overflow outlet on the top cap of the bottle and also on the top of the bellows. Use of the catheter holder enables the vacuum to be controlled to a maximum of 190mm of Hg. If the aperture is closed merely by holding a finger on it, the maximum vacuum possible is raised to 400mm of Hg. Capacity of the jar is 500ml, made up of polycarbonate is unbreakable, & autoclavable. Frame is made up of M.S. with powder coated for a long life span.