1.a valve in the hull of a ship used to let water in or out
1.To clean these filters the main seacocks must be turned ' OFF ' first .
要清洁这些过滤物首先必须通过主要的通海阀‘OFF’。
2.Small craft - Seacocks and through-hull fittings - Part 2 : non-metallic.
小艇.通海旋塞及贯穿艇体配件.第2部分:非金属的