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DN20/ DN25 Brass Storage Esfr Fire Sprinkler. ESFR Technology: Early Suppression Fast Response sprinklers for high-piled and rack storage protection. High Efficiency: Delivers more water at lower pressures or over a greater area of coverage. Durable Material: Constructed from high-quality brass with natural brass surface finish. Wide Application: Suitable for high-piled storage, in-rack storage, and warehouses. Fast Response: Designed for rapid activation in high challenge occupancies. Certified Quality: Complies with ISO and CCCF international quality standards. Customizable Threads: Available with 3/4" or 1" NPT/BSPT connecting threads. OEM Services: Supports logo customization and new product design with client drawings.