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Pneumatic Air Factory Manufacturer Check Valve. Customizable Port Sizes: Available in 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1-1/4, and 1-1/2 inch sizes. CE Certification: Product meets CE safety and quality standards for international markets. OEM and ODM Services: Full customization available from samples with professional manufacturing support. Aluminum Construction: Durable aluminum material ensures reliability in pneumatic systems. ISO9001:2000 Certified: Manufacturing process adheres to international quality system standards. Experienced Manufacturer: Established in 1991 with over 300 employees and 22 years of export experience. 100% Product Inspection: Every finished product undergoes visual and functional inspection.