“活栓”用英语怎么说？

使用陶制的活栓,认为是不够安全的.The use of stoneware cocks is not considered to be safe enough.医生关掉小活栓.The doctor shut off the petcock.该小活栓适用于连接内径为6mm的橡胶管.This petcock is suitable to connect the rubber pipes with the inside diameter of...