More complicated designs have been used in the past but have not had the structural integrity nor the watertight sealing capabilities of the Red Valve Hawse pipe valve.

• 以前所采用的设备则复杂得多，但是反而缺乏结构的整体性，也无法实现象美国红阀公司锚链管道阀门一样的不透水的紧密密封。