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Reliable operation reduces water hammer incidents. Dynamic design allows high velocity air discharge, up to 0.8 bar differential pressure, preventing premature closing. The body is made of metal casting, and all operating parts are made of specially selected corrosion resistant materials. Plastic body (Polypropelene materials) is also available. Lightweight, small dimensions, simple and reliable structure. Vandalism protect by a metal casting body. Special nozzle design, combination of bronze and EPDM rubber, assures long-term maintenance-free operation. The drainage outlets enables removal of excess fluids. Standard cast metal body-baked polyester coating.