... oil leakage .4.Two hydraulic pressure valves control two sections of door closing separately .5.passed the fire-testing by National ... .6.Body length:231mm .7.we can do finish color of silver,brown,golden,white,black,bronze,etc.8.packing:1pcs/small ... request .10.Our doorclosers are often used on the door of safe exit and entrance,hotel,washroom,Resturant, and many places ...