8″ x 4″ Concentric Reducer Order from USA 12 11 月, 2020 8″ x 4″ Concentric Reducer Order from USA American customer continues to buy CONCENTRIC REDUCER SEAMLESS 8″ x 4″ / THK 0.325″ X 0.375″ HEIGHT 6″ ASTM A234 WPB ASEM B16.9 from ZIZI ENGINEERING. Company News