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The NDS® Standard Series 10 in round body is tapered and has a minimum wall thickness of 0.20 in. The cover seat area has six structural support ribs on the underside of the seat, each with a minimum thickness of 1/4 in. The bottom of the body has a 1/2 in flange. The 10 in round cover has an average thickness of 1/4 in. The valve box has a 5/16 in 304 brass nut for the bolt-down as a standard feature.