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Which PestFlap Fits Your Drain?
Sizing is the single most important decision on this page. Nominal pipe size is a starting point, not a guarantee of fit. Take the time to check your actual connection against the table below before ordering.
| Model | PF3 | PF4 |
|---|---|---|
| Nominal Connection | 3-inch | 4-inch / 110-mm |
| Best For | Standard US toilet flanges and floor-drains | Drains, floor drains, gullies & compatible multi-outlet applications |
| Primary Market | United States | UK & International |
| Installation | Retrofit - Confirm compatibility before ordering | Retrofit - Confirm compatibility and insertion depth before ordering |
| Operation | Normally closed, spring-assisted flap | Normally closed, spring-assisted flap |
| Support | Trade & Technical Support | Trade & Technical Support |
| Product Link | View pf3 | view pf4 |
Still not sure?
Send us a photo and the measured internal diameter of your drain opening, and we’ll confirm the right fit before you order, not after.