... Cover mouth forms: conical suction mouth (A), Horseshoe suction mouth (L), plate suction mouth(T), hat-type suction mouth (H)other forms ... 150mm, φ175mm, φ200mm (other specifications should be ordered).External tube material: import PVC steel wire air hose, anti-corrosion, endure ... components and fasteners are all stainless steel 304#.External tube use import PVC hose, anti-corrosion, endure acid, ...