Office Chair Parts Replacement Pneumatic Gas Cylinder Lift. This cylinder has an extra extension at bottom so it will sink deeper into the chair base. It a CLASS 3 with 400N. Load capacity of 250 pounds. The taper on both ends of this office chair seat height adjustment pneumatic gas cylinder is standard in the industry and should fit most chairs sold in the market regardless of who the manufacturer is. Exceeds BIFMA standards.SGS .ISO9001

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