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Huahui FM UL Grooved Flexible Couplings for Firefighting System. Ductile Iron Material: Constructed from ASTM A-536 Gr65-45-12 ductile iron for superior strength. Wide Pressure Ratings: Available in 232PSI, 362PSI, and 1160PSI options for various needs. Customized Surface Finish: Options include Epoxy Powder, Painting, Galvanization, and Dacromet in multiple colors. Ready Stock Availability: High quality products available in stock for faster delivery. Comprehensive Gasket Options: Gaskets available in EPDM, NBR, or Silicon Rubber for sealing. Custom Branding Service: Customized brand HUAHUI available upon request. Versatile Applications: Ideal for fire fighting, petrochemical, gas, and water works systems.