Abstract: A bilge management and control system for a vessel having a full port through-transom threaded pipe fitting located near the lowest point of the interior of a vessel and ending in a flange mounted against the exterior transom wall, with the means for sealing the interior area of the transom from both sides, with hose barb to male plug adapters (or garden hose adapters) and/or solid threaded plugs threaded into one or both ends of the threaded through-transom pipe, at the entry point and at the exit terminus, such that substances may be prevented from entering a bilge, may be introduced into a bilge and/or forward compartments of a vessel, retained and controlled within a bilge and/or forward compartments of a vessel, or directed out of a bilge and/or forward compartments of a vessel by gravity flow, differential pressure or other mechanical means when the solid threaded plugs at one or both ends are removed or back-threaded to unseal the pipe wall's opposing ingress and egress portholes, if they are pres