通海旋塞 meaning in English

round way cock
sea cock=seacock
sea plug
seacock

Small craft - seacocks and through - hull fittings - non - metallic
小艇.通海旋塞及贯穿艇体配件.非金属的
Small craft - seacocks and through - hull fittings - part 1 : metallic
小艇通海旋塞及贯穿艇体的附件第1部分:金属件
Small craft - seacocks and through - hull fittings - part 2 : non - metallic iso 9093 - 2 : 2002 ; german version en iso 9093 - 2 : 2002
小艇.通海旋塞及贯穿艇体配件.第2部分:非金属件