A filter element comprising: a tubular member having a longitudinal axis and including: an exterior wall extending in a longitudinal direction; a first end portion, the first end portion being substantially open, at least partially defining an inlet port configured to provide flow communication into a first chamber of the tubular member, and at least partially defining an outlet port configured to provide flow communication from a second chamber, the second chamber not being in flow communication with the first chamber within the tubular member; a second end portion, the second end portion being located at an end of the tubular member opposite the first end portion; at least one outlet aperture configured to provide flow communication out of the first chamber; at least one inlet aperture configured to provide flow communication into the second chamber; and a vent tube extending longitudinally between the first end portion and the second end portion, the vent tube defining a vent passage configured to provide flow communication between the first end portion and the second end portion of the tubular member; and a filter medium associated with the at least one outlet aperture and the at least one inlet aperture, wherein the filter element is configured such that fluid passing through the filter element from the inlet port to the outlet port passes through both the first chamber and the second chamber, and wherein the second end portion of the tubular member defines a recess configured to receive a projection of a canister in which a drain aperture is defined during use such that the vent tube provides flow communication between the first end portion and a drain aperture in a canister in which the filter element is configured to be positioned. a tubular member having a longitudinal axis and including: an exterior wall extending in a longitudinal direction; a first end portion, the first end portion being substantially open, at least partially defining an inlet port configured to provide flow communication into a first chamber of the tubular member, and at least partially defining an outlet port configured to provide flow communication from a second chamber, the second chamber not being in flow communication with the first chamber within the tubular member; a second end portion, the second end portion being located at an end of the tubular member opposite the first end portion; at least one outlet aperture configured to provide flow communication out of the first chamber; at least one inlet aperture configured to provide flow communication into the second chamber; and a vent tube extending longitudinally between the first end portion and the second end portion, the vent tube defining a vent passage configured to provide flow communication between the first end portion and the second end portion of the tubular member; and an exterior wall extending in a longitudinal direction; a first end portion, the first end portion being substantially open, at least partially defining an inlet port configured to provide flow communication into a first chamber of the tubular member, and at least partially defining an outlet port configured to provide flow communication from a second chamber, the second chamber not being in flow communication with the first chamber within the tubular member; a second end portion, the second end portion being located at an end of the tubular member opposite the first end portion; at least one outlet aperture configured to provide flow communication out of the first chamber; at least one inlet aperture configured to provide flow communication into the second chamber; and a vent tube extending longitudinally between the first end portion and the second end portion, the vent tube defining a vent passage configured to provide flow communication between the first end portion and the second end portion of the tubular member; and a filter medium associated with the at least one outlet aperture and the at least one inlet aperture, wherein the filter element is configured such that fluid passing through the filter element from the inlet port to the outlet port passes through both the first chamber and the second chamber, and wherein the second end portion of the tubular member defines a recess configured to receive a projection of a canister in which a drain aperture is defined during use such that the vent tube provides flow communication between the first end portion and a drain aperture in a canister in which the filter element is configured to be positioned.