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One way plastic air valve is a kind of valve which is made of plastic. An air valve is a pipe fitting that allows air trapped inside plumbing to escape. Automatic valves that vent whenever air is present in the system are available, along with valves that must be manually operated to vent air. This type of fitting comes in a number of different styles for various applications and can be obtained at a hardware store or through a company that supplies pipe fittings. The one-way valves used at present serve this purpose perfectly, opening when slight internal overpressures occur and closing immediately when they cease.