EC21 Product Catalogs - o-ring boxes komatsu http://www.ec21.com/ec-market/o-ring boxes komatsu.html O-ring Boxes (Komatsu,Hitachi,Caterpillar,Kato)http://asoem.en.ec21.com/O_ring_Boxes_Komatsu_Hitachi--2131235_1742227.htmlo-ring box in china-made can suitable for the (INCH AND MM) CATERPILLAR KOMATSU HITACHI KATO KOBELCO DAEWOO HYUN20090602