1、防冻阀
...frost zone冰冻区frost valve防冻阀frost thrust解冻推力 ...
2、防冰阀
...防冰冻 anti-icing防冰阀 frost valve防冰剂 deicer; deicing agent; ice-control chemical ...
frost t valve防冻阀
Frost free valve assembly发明名称
frost proof drain valve防冻排水阀
Automatic Frost Valve自动防冻阀
frost-proof drain valve防冻排水阀