Non Return & Back Water Valves

Fernco’s, previously known as Flexseal, Non-return valves allow sewer or surface water materials to freely flow in the direction of the systems mains but block backflow of those materials in the opposite direction in instances, such as, flooding.

  • Unobtrusive to natural flow
  • A proven flood prevention method
  • Helps to protect homes, properties, commercial buildings, roads etc
  • Also suitable as rodent deterrents with rat block features
  • Maintenance free