Val-Matic swing check valveThe AWWA swing check valve from Val-Matic Valve & Manufacturing Corp. is designed for municipal and industrial water and wastewater applications. The valve prevents backflow by automatically closing when fluid reverses direction. Features include a ductile iron disc that swings open upon pump startup. When closed, the valve provides a tight shutoff through the field-replaceable stainless steel seat. Valves are available with three closure options (lever and weight, air cushion, lever and spring) and 2- to 24-inch and 30- to 48-inch sizes. 630/941-7600; www.valmatic.com.Assmann large double-wall tanksCylindrical double-wall tanks from Assmann Corporation of America eliminate chemical spills
