Features: Heavy duty vertical check crafted from premium brass with reinforced structure, designed to withstand high pressure systems while preventing backflow and minimizing water hammer for enhanced pipeline safety. Features a 4 inch large diameter threaded connection, spring assisted rapid closure mechanism, and corrosions resistant construction, ensuring smooth flows control in demanding environments. Ideal for professional plumbers, industrial maintenance teams, and HVAC technicians requiring reliabled backflow prevention in commercial or residential pressurized systems. Perfect for vertical installation in water supply networks, irrigation setups, and chemical processing plant where space optimization and reverse flows protective are critical. Combines brass rubber sealing with vertical orientation flexibility, delivering leakproof performances across temperature variations while maintaining minimal pressure drop. Specifications: Component: Brass + Rubber Height dimension: 49mm/55mm/59mm Package Includes: 1pcs Check Connection 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.