Features: Our check valves is made of brass and stainless steels, which can prevent unnecessary backflow. This valves set is durable, resistant to highly temperatures and highly pressure and has good rust protections performances. At end of the 1/2 inch check valves there is a fine mesh stainless steel filter that prevents dirt and particles from entering the water supply system and prevents the liquid in the pump pipe from flowings back into the water supply system. Easy to install: our filter check valves is connect to pipes and hoses by external thread, just a few turn to tighten our check valves. Wide applications: Our check valves water is suitable for water suction pipes, pumps, fountains, washing machines and garden sprinklers and ensures comfort. Specifications: Material: Brass+stainless Steels Brass Bottom Valves Size: Approx. 70x35mm/2.75x1.38inch Quick Connection Size: Approx. 35x17mm/1.38x0.67inch Package Includes: 2x Check Valves 2x Quick Connections note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.