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High-Performance 21 1/4" Annular Bop Packing Element 2000psi. High Performance Material: Made of rubber based polymer alloy and high strength metal frame conforming to API 16A standards. Cost Effective Solution: High cost performance compared to other same type packing elements for oil field drilling work. Comprehensive Warranty: 1 Year warranty coverage with online after-sales support available for technical assistance. Minor Customization: Offers minor customization options for operating temperature and dimensions to fit specific needs. Standard Compliance: Conforms to USA 16A, SATM D412, D624, D2240 and D471 standards for safety and reliability.