Features: 100% brand new and high quality Thick copper material: nickel-plated surface, durable and anti-oxidation. Precise threaded interface, firm installation and connection, no leakage, pressure and explosion-proof, no leakage. One thing for multiple purposes: suitable for many scenarios such as toilets, water towers, water heaters, and solar energy. Function: Used to prevent the toilet water from flowing back into the water pipe. Type: Male to Female Thread Check Valve / Female to Male Thread Check Valve / Male to Male Thread Check Valve. Package Includes: 1x Check Valve Specifications: Material: Copper Type: Male to Female Thread Check Valve / Female to Male Thread Check Valve / Male to Male Thread Check Valve Diameter: Approx. 20mm/0.79inch Length: Approx. 3.3cm/1.3inch note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.