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Copper Forged Internal-Lock Quick-Connect Coupling for Fire High-Pressure Hose. High-Quality Brass Material: Made of brass with anti-corrosion and anti-rust properties for durability. Strong Sealing Performance: Features strong tightness and good sealing for high-pressure resistance. Multiple Certifications: Certified with GB8013-2005, GS, CCCF, CCC, and CE standards. Impact Resistance: Designed to withstand impact and ensure long service life. Fast Lead Time: Average lead time within 15 workdays for both peak and off seasons.