AWWA C207 is US flanges standard, popular using in water supply works, flanges pressure class D, class E, class F and so on, flanges type ring, blind and HUB, AWWA C207 flanges is all different to ANSI B16.5 flanges or any other flanges, the dimensions of AWWA C207 are special, steel ASTM A181 GR60 by forging.
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