Drawing No. :LSD9009-00-00A Main Features :(a)Composite piston With Steel Crown and Aluminum skirt,shake cooling,piston skirt adopt convexity change to ... ,DF4C,DF4D,DF5,DF7C,DF7D locomotives .(e)Convenient assembly , disassembly and overhauling . 240/275 Composite Piston with Steel Crown and Aluminum Skirt