Rat-Proof Flap OUT - Replacement

Why flap replacement matters

In many cases, rat intrusion does not come from the entire drainage system,
but from a single weak component: the internal flap.
When that flap is damaged or gnawed, the opening it was meant to protect becomes accessible.

Example of a damaged flap that no longer protects the opening

Plastic flaps were not designed to resist repeated intrusion attempts.
Once compromised, they may no longer provide reliable protection.

A simple replacement solution

Instead of replacing the entire valve system, the internal flap can be replaced
with a stronger stainless-steel component designed for durability.

Stainless-steel replacement designed for long-term use

Compatible valve models

Replacement is possible on the most common non-return valve models, including:

• IPEX
• CANPLAS
• OATEY
• BOW
• PRO FLO

Typically in 3″ and 4″ ABS or PVC configurations.

How to identify your valve

• Check with your plumber
• Look at the valve cover
• Inspect the flap anchoring system

How replacement works

The process is simple:

• Open the valve
• Remove the original flap
• Install the replacement flap
• Close and secure the system

Do you need a plumber?

In many cases, replacement can be done in minutes.
However, if you are unsure about your system or access,
consulting a qualified professional is always recommended.

Why this approach makes sense

• No need to replace the full valve system
• Targets the actual weak point
• Simple and direct solution
• Improves durability at the entry point