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Hydraulic φ 3 Ball-Type Expansion Sealing Plug. High Pressure Sealing: Supports working pressure up to 35-45MPa with leak-proof performance. Wide Size Range: Available in diameters from 3mm to 22mm with customized options. Durable Material: Constructed with heat-treated bearing steel and case-hardened sleeve. ISO 9001 Certified: Manufactured under strict international quality management standards. SFC Standard Compatible: Fully consistent with SFC original model sizes for perfect interchangeability. Easy Installation: Simple installation using basic tools to press the steel ball inward. Broad Application: Suitable for hydraulic valves, cylinders, and pneumatic parts sealing.