Flap Gates can be made of many different types of metal (Cast or Ductile Iron, Aluminum, or Stainless Steel, they are typically rated in the amount of head pressure they can withstand without damage.


Flap Gates are used to stop reverse flow at the end of pipes and structures. They are also used for safety, to keep people and animals from accessing the inside of pipes and structures.


Flap Gates are commonly mounted with the flat back flange which is integral to the frame casting. They can also be mounted directly to the plain end of a pipe or directly to a structure. In some cases Wall Thimbles are used with “new” concrete structures.