Elbow outtake drainage vent pipe system stretched top snorkel the main pass trachea, vice outtake combined outtake, ring snorkel snorkel, appliances, convergence snorkel and exclusive outtake type, respectively, with in a different location, which cover type ventilation tube suitable for water storage pond and tank installation. Elbow outtake to the drainage system within the air flow, pressure stability, and is provided with the atmosphere communicating pipe waterproof seal destruction. , Elbow outtake performance, emissions of toxic or harmful gases inside the drainage channels to go out to meet the health requirements; 2, outtake to complement fresh air to the reservoirs, water tanks and drainage channels, in order to reduce the corrosion of metal pipes extend the service life; 3, reservoir, tank vent pipe in order to improve the capacity of the drainage system should be set up more than two (take a small example, an intravenous drip when the bottle down the liquid will flow must be plugged into a pass trachea, through the atmosphere at one end, to pass the gap between the liquid surface and the bottom at one end, to prevent the negative pressure is formed within the pipe, to ensure smooth drainage) preventing backwater formation and odor, reduce the amplitude of the pressure fluctuations, the protection of the water seal, preventing water seal destruction. 4, can quickly reservoir and water vapor in the tank and harmful gases discharged built-the gauze gauze effectively prevent prevent vector, insects and dust to enter in order to destroy the water quality. Elbow outtake Description 1 outtake design filter (network, cloth) layer average gas velocity of 0.75 m / s. Filter cloth should be installed using the same material stitched inside the cover can be non-toxic and non-metallic materials production; outtake overburden thickness (H1) 0.0m, 0.5m, 1.0m three designs, 0.0m applies in the South region, 0.5m applies to the central region, and 1.0 apply to cold regions. 3 after welding rust, anti-corrosion requirements based on customer design requirements. The conditional region according to the design requirements made of stainless steel, in order to achieve a better anti-corrosion and extend the service life.