water seal tank
... water seal gate valves ==> 水封闸阀 water seal tank ==> 水封槽 water sealed explosion door ==> 水封防爆门 ...
seal tank
... seal pit 封闭纹孔 seal tank 水封槽 seal 封贴;密封 ...
pit for water seal pot
wiper seal groove
sealing scheme with u trough