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B. Where required, gate valves shall be provided with a box cast in the road and a box cover. Box cover opening shall be for valve stem and nut. The contractor shall provide valve wrenches and extension stems from the same manufacturer as the valve to actuate the valves. The floor box and cover shall be in accordance with IRCDUS Approved Manufacturer's Product List. (See Drawing M-5). 11.03 CHECK VALVES A. Check valves for ductile iron pipelines shall be swing type and shall meet the material requirements of AWWA Standard Specifications C508-01, or latest revision. The valves shall be iron body, bronze mounted, single disc, 150 psi working water pressure, non-shock, non-slam, slow closing, and hydrostatically tested at 300 psi. Ends shall be 125 pound ANSI B16.1 flanges or 125 pound ANSI B2.1 threaded fittings, depending upon location. B. When there is no flow through the line, the disc shall hang lightly against its seat. When open, the disc shall swing clear of the waterway. C. Check valves shall have bronze seat and body rings, extended bronze hinge pins, and bronze nuts on the bolts of bolted covers. D. Valves shall be so constructed that disc and body seat may easily be removed and replaced without removing the valve from the line. Valves shall be fitted with an extended hinge arm with outside lever and weight, as necessary. E. Check valves for PVC pipe less than 3" in diameter shall be of PVC Type 1, Series BC, with union, socket, threaded, or flanged ends, as required and shall be per the Approved Manufacturer's Product List. 11.04 PLUG VALVES A. Plug valves shall be non-lubricated eccentric type with semi-steel bodies, resilient faced plugs, and stainless steel or nickel seats in the body. Port area shall be at least 80 percent of full pipe area for valves 20 inches and smaller. Port area shall be 70 percent for all valves 24 inches and larger. All valves 4 inches and larger shall be of the bolted design. All exposed nuts, bolts, springs, and washers shall be hot dipped galvanized, except exposed hardware for submerged valves shall be of stainless steel. Valve bodies shall be semi-steel with 125-pound ANSI Standard flanged ends for interior or aboveground service; mechanical joint for buried service and for use with threaded cast iron or ductile iron piping shall have screwed end connections. The plug shall be one 11 - 2 � ;)_3. L. 3.