DOUBLE PACKING AND LEAK-OFF A lantern ring and leak-off pipe provide for detection or removal of leakage, if any, from lower packing set (optional).

• 双填料和无泄漏一个套环和无泄漏管道用于探测或泄漏拆卸,即便要,也要配置下部密封圈组合(可选择的)