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🚫 Seal out rats, open up peace of mind!
The MF3 Rat Barrier Non-Return Valve is a 4-inch lift check valve designed for plastic or salt-glazed clay pipes. It installs easily in inspection chambers to prevent rats from entering drainage systems by allowing waste to flow out while closing immediately after to block backflow. Made from high-grade plastic with a stainless steel spring, it offers a cost-effective, durable solution to vermin intrusion in home drainage, ideal for professional-grade pest control and plumbing maintenance.
| ASIN | B00PLN1UPA |
| Best Sellers Rank | 60,522 in Garden ( See Top 100 in Garden ) 6,767 in Pest Control Products |
| Brand | Multi-Flap |
| Connector Type | Sweat, Socket Weld |
| Customer Reviews | 3.6 out of 5 stars 107 Reviews |
| Exterior Finish | Plastic |
| Exterior finish | Plastic |
| Inlet Connection Size | 4 Inches |
| Inlet Connection Type | Socket Weld |
| Inlet connection size | 4 Inches |
| Inlet connection type | Socket Weld |
| Manufacturer | Multi-Flap |
| Material | Plastic, Stainless Steel |
| Model Number | MF3 |
| Number of Ports | 1 |
| Outlet Connection Size | 4 Inches |
| Outlet Connection Type | Sweat |
| Outlet connection type | Sweat |
| Part Number | MF3 |
| Set Name | Rat Barrier |
| Size | 4 inches |
| Thread Size | 4 inches |
| Thread Type | Non-threaded |
| UPC | 609788764618 |
| Unit Count | 1.0 count |
| Valve Type | Lift Check Valve |
B**K
Great value product.
Bought these a couple of years ago. Easy to fit and no problems with them at all. A lot less expensive than metal ones and seem to last.
D**N
The door is sprung with just the right amount of tension to close tight once waste or water has passed through
For ease of fitting it's a 5 star product, once I had chipped away a small section of benching in the sewer it slotted in and worked perfectly. The door is sprung with just the right amount of tension to close tight once waste or water has passed through, which it does without issue. Time will tell if the filthy, horrible things are getting in via the drains but already activity seems to of dropped off meaning there may just be the odd one that needs to leave and shut the door on the way out. Providing the door spring is stainless steel and they don't chew through the plastic/polyprop door itself it appears well made and should last.
P**M
Broke whilst being fitted! So useless and a waste of money for a bit of plastic!!!!
My husband attempted to fit following the instructions but the flap broke whilst he was putting the valve into the pipe. Totally useless and clearly was either faulty or just not fit for purpose. To top it all, I cannot return the item as it has been down the sewer!!! I am very unhappy about wasting £25 on a piece of plastic that has not served its purpose and am certainly not wasting another £25.
M**N
Rat prevent
It was easy to fit just remember to put some soapy water on it to make it easier to fit working fine since I installed it
J**N
no seal
would have expected a rubber seal. we need it for water not rats. so disappointed will try it and see if it works
M**K
Just the job.
In and working great.
T**E
works well
It does exactly what I wanted it for.
M**Y
Installed correctly. However after 3 days found it had ...
Installed correctly. However after 3 days found it had blocked the drain as toilet paper and fecal matter was trapped. Took it out and binned it.
Trustpilot
3 weeks ago
1 month ago