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Dampers & Chimney Caps > Dampers > Round To Square Adapters Products - Round To Square Adapters 855 RS Adapter, FT88/6" By Gelco Other Sizes: -- Choose a size -- 855 RS Adapter, FT88/6" 865 RS Adapter, FT88/7" 875 RS Adapter FT88/8" 1385 RS Adapter FT1313/9" 1395 RS Adapter, FT1313/10" 1315 RS Adapter, FT1313/11" 1312 RS Adapter, FT1313/12"