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Do not base your order on the picture presented.
This Gomco unit is engineered to provide suction by alternating the expansion and contraction of air within a cylinder at regular intervals. There are no moving parts, resulting in a quieter, more reliable operation. The unit is designed to operate for an extended period of time, while solid state controls help to assure mild suction. This drainage unit includes two preset drainage levels (90 mm Hg and 120 mm Hg). The bacteria filter reduces environmental hazards by not allowing pathogens to enter exhaust gas, and helps to prevent fluid and aerosol contamination of the unit. Unit includes a 1/2-gallon glass or disposable collection bottle, floor bottle carrier and two 6-foot lengths of disposable tubing. Model 270 is UL listed.