全密封結構，無油(you)耗，免維(wei)護(hu)，綠(lv)色環保(bao)型產品，產品性能符合(he) EN81-1 要(yao)求， 每次(ci)動作后不需要(yao)人員調(diao)整開關打桿(gan)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.