Althon designs and manufactures high-quality HDPE fish- and eel-friendly flap valves and fish-friendly flap gates.

Fish-friendly flap valves are designed to prevent harm to fish as they migrate through flood and flow control equipment.

  • Manufactured in HDPE and 316L stainless steel

  • 50-year design life

  • Typically designed to max 5Mwc (72hrs) and 1Mwc (50 years); can be tailored to suit specific requirements

  • Can be factory-fitted to Althon's precast concrete headwalls and chambers

  • Supplied with an EPDM seal, stainless steel fixings and chemical anchors for installation on site