Fernco’s 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. This range of retrofit Non-Return Valves (NRV’s) can be installed directly into existing manholes by simply pushing the NRV into the desired pipe inlet.

The Retrofit NRV’s effortless pushfit design means it can be fitted in minutes and does not require any specialist expertise or equipment.

• 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.
• WRc Approved (4 inch only).