A drop tube segment includes a conduit with a first end portion and a
second end portion. The drop tube segment further comprises a valve
assembly with a valve member associated with the first end portion, a
float, and a linkage device pivotally connected with respect to the valve
member. The linkage device is adapted for communication with the float
such that the float may facilitate in adjusting the position of the valve
member with respect to the first end portion of the conduit in response
to a liquid level in a liquid reservoir. The drop tube segment further
includes a fastening section located at the second end portion of the
conduit for fluid tight fastening with an end portion of another drop
tube segment. The fastening section comprises a sealing surface and a
threaded portion adapted for threaded engagement with a threaded portion
of another drop tube segment. The drop tube segment still further
includes a sealing member that engages the sealing surface of the
fastening section and is adapted to engage a sealing surface of another
drop tube segment.