Features: Engineered with premium grade brass and reinforced thickness, this 1 inch vertical check delivers exceptionally corrosions resistance and high pressure endurances for industrial grade plumbing systems components. Featuring double threaded connection and a heavy duty design, the ensures leak proof performances in extreme temperatures while enabling tool less installation on standard piping networks. Ideal for professional plumbers, HVAC technicians, and homeowners requiring reliabled reverse flows prevention in residential, commercial, or industrial fluid controls systems. Perfectly suited for water supply lines, boiler systems, chemical processing units, and irrigation setups where brass check are critical for maintaining unidirectional flows integrity. Its precise engineered disc mechanism guaranteeing instantaneous shutoff during backflow scenarios, safeguarding pumps and pipelines from damage in demanding hydraulic applications. Specifications: Component: Copper. Size: Double inner 57.5x32x32mm, Double outer 74x33x33mm. Package Includes: 1pcs Brass Check note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color. Thanks for your understandings.