它是一款非常小巧的真空管，形状和大小如浴缸塞，内含一个柱塞和弹簧，由两个小型空气软管连接。
It was a small vacuum chamber, about the size and shape of a bathtub stopper, that contained a plunger and spring, and had two small air hoses attached to it.
还可在软管和柱型通管间连接一可弯曲后固定成各种形状的半软硬弯管。
It may also have one bent tube capable of being bent into different shape connected between the hose and the column type pipe.
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