An aspirator for creating vacuum comprising: a housing defining a fluid passageway therethrough, the fluid passageway comprising: a first tapering portion gradually tapering from a larger internal opening to a smaller internal opening; and a second tapering portion gradually tapering from a larger internal opening to a smaller internal opening; wherein the first tapering portion and the second tapering portion converge toward one another with their smaller internal openings facing one another; a gate positioned between and in fluid communication with the first tapering portion and the second tapering portion of the housing, the gate having a first Venturi tube (184, 185) with a Venturi opening in fluid communication with a suction port and a second Venturi tube (186, 187) with a Venturi opening in fluid communication with the suction port, wherein the first Venturi tube creates a vacuum when fluid flows therethrough, wherein the second Venturi tube creates a vacuum when fluid flows therethrough; and an actuator coupled to the gate, the actuator operable to move the gate to place the first Venturi tube (184, 185) or the second Venturi tube (186, 187), as selected, into alignment with the smaller internal openings (132, 134) of the first and second tapering portions (128, 129); characterized in that the gate comprises a first gate member and a second gate member with a biasing member disposed therebetween to bias the first gate member and second gate member away from one another and into engagement with a gate housing portion of the housing enclosing the gate. a housing defining a fluid passageway therethrough, the fluid passageway comprising: a first tapering portion gradually tapering from a larger internal opening to a smaller internal opening; and a second tapering portion gradually tapering from a larger internal opening to a smaller internal opening; wherein the first tapering portion and the second tapering portion converge toward one another with their smaller internal openings facing one another; a first tapering portion gradually tapering from a larger internal opening to a smaller internal opening; and a second tapering portion gradually tapering from a larger internal opening to a smaller internal opening; wherein the first tapering portion and the second tapering portion converge toward one another with their smaller internal openings facing one another; a gate positioned between and in fluid communication with the first tapering portion and the second tapering portion of the housing, the gate having a first Venturi tube (184, 185) with a Venturi opening in fluid communication with a suction port and a second Venturi tube (186, 187) with a Venturi opening in fluid communication with the suction port, wherein the first Venturi tube creates a vacuum when fluid flows therethrough, wherein the second Venturi tube creates a vacuum when fluid flows therethrough; and an actuator coupled to the gate, the actuator operable to move the gate to place the first Venturi tube (184, 185) or the second Venturi tube (186, 187), as selected, into alignment with the smaller internal openings (132, 134) of the first and second tapering portions (128, 129); characterized in that the gate comprises a first gate member and a second gate member with a biasing member disposed therebetween to bias the first gate member and second gate member away from one another and into engagement with a gate housing portion of the housing enclosing the gate.