backup plate,filler piece,filling piece,shim block,gasket,lining,shim,gasket,packing,spacer strip,pad,carrier ring,clout,cushion ring,filler ring,dump,filling-in ring,in-sertion/in-sert ring,joint-packing,annular packing, packing collar,sliding plate ring,washer,grommet,disc.
挑一个用。