"Seacock" is a term commonly used in boating and marine industries to refer to a valve in a boat's hull that regulates water flow. However, there are several other synonyms for "seacock" that can be useful to know. These include "hull valve", "through-hull valve", "thru-hull fitting", and "sea valve". Each of these terms refers to the same or similar components of a boat's plumbing system. Understanding these synonyms can be helpful when discussing or repairing a vessel's systems, particularly when dealing with terminology differences between regions or countries.