Aeration Impellers Image: Fiberglass aeration impellers manufactured by TEHRAN SEYLAB ZIST Engineering Company • Application: for connecting electromotor gearboxes to surface aeration equipment and mechanical water and wastewater mixers. • Material of Impellers: Fiberglass / Stainless Steel / Steel with Zinc Rich and Epoxy Coating. The sizes of Turbines: 400 to 3000 mm in diameter based on the order. image: Steel aeration impellers made by TEHRAN SEYLAB ZIST Engineering Company All types of aeration turbines are designed and manufactured by TEHRAN SEYLAB ZIST Company from steel and fiberglass material in your required dimensions and designs. TEHRAN SEYLAB ZIST Engineering Company Different Types of Water and wastewater Equipment We offer you the best quality.