No. Description Qty Standard Material Protection Optional Material 1 Indicator Screw 1 Plastics 2 Indicator 1 Plastics 3 Circlip 1 Stainless Steel     4 Gasket 1 Engineering Plastics 5 Body 1 Cast Aluminum Hard Anodize, Etc 6 Retainer Ring 1 Engineering Plastics 7 Cam 1 Steel Alloy 8 O Ring (Upper Bearing) 1 NBR Fluorine Rubber/Silicone Rubber 9 Upper Bearing 1 Engineering Plastics 10 Pinion 1 Carbon Steel Nickel Plated   11 Lower Bearing 1 Engineering Plastics 12 O Ring (Lower Bearing) 1 NBR Fluorine Rubber/Silicone Rubber 13 O Ring (Adjust Screw) 2 NBR Fluorine Rubber/Silicone Rubber 14 Nut (Adjust Screw) 2 Stainless Steel     15 Adjust Screw 2 Stainless Steel     16 Piston 2 Cast Aluminum/Casting Anodized/Zinc Galvanized   17 Guide (Piston) 2 Engineering Plastics 18 O Ring (Piston)   2 NBR Fluorine Rubber/Silicone Rubber 19 Washer (Piston) 2  Engineering Plastics   20 Spring 0~12 Spring Steel Dipping Paint   21 O Ring (End Cap) 2 NBR Fluorine Rubber/Silicone Rubber 22 End Cap 2 Cast Aluminum Powder Coating, Etc 23 Cap Screw 8  Stainless Steel