An apparatus comprising: - a housing including a port, a closed position-determining hard stop, an open position-determining hard stop, a screened position-determining hard stop, and a passage; - a flow control member including a screen, wherein the flow control member is displaceable relative to the port; - wherein the open position-determining hard stop determines the second or open position of the flow control member, and the closed position-determining hard stop determines the closed or first position of the flow control member; and - a hard stop engager disposed within the passage between the flow control member and the housing for coupling with the flow control member; wherein the flow control member is displaceable, relative to the port, by a first displacement from a first position, corresponding to disposition of the port in a closed condition, to a second position, corresponding to disposition of the port in an open condition, and displaceable, relative to the port, by a second displacement from the second position to a third position corresponding to disposition of the port in a screened condition, the flow control member and the hard stop engager are cooperatively configured such that: (i) while there is an absence of coupling between the flow control member and the hard stop engager, the displacement of the the flow control member relative to the port is limited between the first or closed position, determinable by the closed position-determining hard stop, to the second or open position, determinable by the open position-determining hard stop, (ii) while the flow control member is being displaced from one of the open position and the closed position, the hard stop engager becomes coupled to the flow control member such that the hard stop engager translates with the flow control member; and (iii) while the hard stop engager is coupled to the flow control member, displaceability of the flow control member, relative to the port, is limited by the screened position-determining hard stop such that a screened position of the flow control member occurs response to engagement of the hard stop engager with the screened position-determining hard stop, wherein the screened position corresponds to disposition of the flow control member relative to the port such that at least a portion of the screen is disposed in alignment with the port such that the port is obstructed, or substantially obstructed, by the at least a portion of the screen for interfering with conduction of oversize solids through the port. - a housing including a port, a closed position-determining hard stop, an open position-determining hard stop, a screened position-determining hard stop, and a passage; - a flow control member including a screen, wherein the flow control member is displaceable relative to the port; - wherein the open position-determining hard stop determines the second or open position of the flow control member, and the closed position-determining hard stop determines the closed or first position of the flow control member; and - a hard stop engager disposed within the passage between the flow control member and the housing for coupling with the flow control member; (i) while there is an absence of coupling between the flow control member and the hard stop engager, the displacement of the the flow control member relative to the port is limited between the first or closed position, determinable by the closed position-determining hard stop, to the second or open position, determinable by the open position-determining hard stop, (ii) while the flow control member is being displaced from one of the open position and the closed position, the hard stop engager becomes coupled to the flow control member such that the hard stop engager translates with the flow control member; and (iii) while the hard stop engager is coupled to the flow control member, displaceability of the flow control member, relative to the port, is limited by the screened position-determining hard stop such that a screened position of the flow control member occurs response to engagement of the hard stop engager with the screened position-determining hard stop, wherein the screened position corresponds to disposition of the flow control member relative to the port such that at least a portion of the screen is disposed in alignment with the port such that the port is obstructed, or substantially obstructed, by the at least a portion of the screen for interfering with conduction of oversize solids through the port.