全密封(feng)結構，無油耗，免維(wei)護，綠色環(huan)保型產品(pin)，產品(pin)性(xing)能符合(he) EN81-1 要求， 每次動作(zuo)后不需要人員調整開(kai)關打桿垂直位置。

Sealed without any oil leakage, free of maintenance. the are green productes, these buffers are produced and tested copmletely in conformity with EN81-1, It is not necessary to make any adjustment of the swicth activating rod when it is compressed