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OEM siphon drainage fitting on sale.
A siphonic roof drainage system differs from a gravity system in two main ways. First, the outlets are specially designed to restrict the entry of air. Second, the rainwater pipes are designed to run full-bored from gutter level to downpipe. The “priming” process, which is needed to make the system operate siphonically, allows water to discharge at a faster rate, thus clearing the gutter more quickly when compared to a gravity system. (See comparison)
In gravity system, when water flowing in the downpipe it spirals the inner wall of the pipe (Vortex), and there is an air-filled core down the center of the water flow, resulting in an inefficient drainage
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