F-25 Medium Duty Flap Gates

WATERMAN F-25 MEDIUM DUTY FLAP GATES are designed for applications with maximum 25 foot seating heads.  Each gate is custom-made to job requirements.

Key Features:

  • Sizes 4″ to 60″ diameter
  • Automatic operation
  • Cast iron frame and cover
  • Machined seating surfaces for tight closure
  • 2.5 to 5 degree seating angle
  • Field-adjustable linkage allows sensitivity adjustment
  • Lifting eye in cover for manual operation for maintenance
  • Standard bronze hinge bushings; stainless steel hinge pins, studs and nuts
  • Flatback or spigotback frame, mounting bolts sold separately
  • Not recommended for pump discharge where violent slamming may occur


  • Iron, bronze or neoprene seats.  Use of neoprene provides long life tight seal and cushioning of closure.
  • Monel or brass hinge pins, studs and nuts
  • Stainless steel, ductile iron or manganese bronze hinge links
  • Permanently lubricated bronze or PTFE bushings
  • Custom coatings including epoxy, coal tar or total galvanizing