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The 3/4" Febco 805YS Series Double Check Valve Assemblies began production in 1973. Although discontinued in 2003, a full line of repair parts are still available at Constructed of a bronze body with plastic poppet style check valves. The valve is a wye pattern, featuring 2 covers, both of which should be removed carefully as there is spring tension against the covers. The 805YR models have removable seats. A special seat removal tool is required. The "S" Suffix stands for silicone check rubbers. Normal rubbers will work in this device.