Imported high quality vent cap regulate the internal pressure exactly.

进口优质安全阀，精确阀控调节压力。

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After installing the FV-4M1, back off the small vent cap two turns (see Fig. 4).

在安装排气阀f V - 4 M 1后，将小排气帽松开旋转两圈(参阅图4)。

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Caps shall comply with the performance requirements of Cap Size, Ventilated Caps Vent Area or Ventilated Caps Air Flow.

笔帽应执行笔帽规格，通气帽的通风区域或通气帽的空气流量的要求。

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