Rat Blocker Supply and Fitting in Hertfordshire
What Is a Rat Blocker?
A rat blocker is a stainless steel non-return valve fitted inside your drain pipe, usually within an inspection chamber.
The device allows wastewater and toilet waste to flow freely out of your property into the sewer network, but prevents rats from travelling back through the pipes into your home.
Rats commonly travel through drainage systems looking for food and shelter. Once inside a property’s pipework they may attempt to enter buildings through damaged drains, toilets or internal waste pipes. Installing a rat blocker provides a reliable barrier against this.
Nex Pest Control supply and install 4 inch and 6 inch rat blockers suitable for most domestic drainage systems.
How a Drain Rat Blocker Works
Rat blockers use a simple but highly effective mechanical design.
The device sits securely inside the drain pipe and contains a steel hinged flap or valve.
When water or waste flows through the pipe, the flap opens to allow it to pass into the main sewer system. Once the flow stops, the flap closes automatically, preventing rats from pushing through the pipe.
In simple terms:
Water and waste can flow out of your drains — but rats cannot get in.
Because the rat blocker is usually installed in the final inspection chamber before the sewer connection, one blocker can often protect multiple drain lines connected to your property.
Why Rats Enter Properties Through Drains
Many rat infestations begin in the sewer network.
Damage within drains, broken pipework, or collapsed sections of sewer pipe allow rats to move through drainage systems and search for access into buildings.
In some cases rats have even been known to chew through internal plastic waste pipes to gain entry into properties.
Common signs rats may be entering through your drains include:
• Rat sightings around inspection chambers
• Scratching or movement within pipework
• Rats appearing inside toilets or bathrooms
• Evidence of rat activity in basements or lower floors
• Persistent rat problems despite external baiting
Where drain entry is suspected, a CCTV drain inspection can identify the exact cause of the issue.
Nex Pest Control can carry out CCTV drain inspections to locate faults, rat activity or entry points within your drainage system.
Professional Rat Blocker Installation
Installing a rat blocker correctly is essential for it to function effectively.
Our technician will first locate the appropriate inspection chamber and determine the correct pipe size before fitting the blocker securely within the drain line.
The installation process typically includes:
Inspection of the drain chamber
Confirming the pipe diameter (4 inch or 6 inch)
Correct positioning of the rat blocker within the pipe
Secure fitting to ensure stability and proper operation
Testing the flap mechanism
The installation process is usually quick, non-invasive and completed within a single visit.
Benefits of Installing a Rat Blocker
Installing a rat blocker provides long-term protection against sewer rat ingress.
Key benefits include:
Preventing rats entering your property through drains
Protecting toilets and internal pipework from rat access
Reducing the risk of repeat rat infestations
Providing a humane and environmentally friendly solution
No chemicals or poisons required
Long-lasting stainless steel construction
For many properties, a rat blocker provides one of the most effective preventative measures against sewer-related rat problems.
CCTV Drain Inspections for Rat Problems
If rats are repeatedly entering your property, it is often necessary to investigate the drainage system.
Nex Pest Control provide high-definition CCTV drain inspections which allow us to:
Identify rat activity within drains
Locate broken or damaged pipework
Detect entry points within the drainage system
Confirm the correct position for a rat blocker
Photographic and video evidence from the inspection can be provided so you can clearly see the condition of your drains.
Areas We Cover
Our rat blocker supply and installation service is available to residential customers across:
Stevenage
Hitchin
Letchworth
Welwyn Garden City
Hertford
Baldock
and surrounding towns and villages in Hertfordshire
If you are unsure whether we cover your area, simply contact us and we will be happy to help.
Why Choose Nex Pest Control?
Homeowners across Hertfordshire trust Nex Pest Control for reliable pest prevention and rodent control.
We provide:
Experienced local pest control specialists
Professional rat blocker supply and installation
CCTV drain inspections available
Fully insured pest control services
Fast response times across Hertfordshire
Transparent pricing with no hidden costs
Our goal is not just to treat rat infestations but to identify the root cause and prevent them returning.
Frequently Asked Questions About Rat Blockers
Do rat blockers harm rats?
No. Rat blockers are a humane solution that simply prevent rats from travelling through the pipe into your property.
Will a rat blocker affect the flow of my drains?
No. When installed correctly the valve opens freely to allow normal wastewater flow through the pipe.
How long does a rat blocker last?
Most rat blockers are made from high-grade stainless steel and can last many years when properly installed.
Book Your Rat Blocker Installation Today
If you are experiencing rats in your drains or want to prevent them entering your property, installing a rat blocker is one of the most effective long-term solutions.
Nex Pest Control supply and install professional rat blockers across Hertfordshire.
Call 01438 870688 today to speak with a technician or request a call back using our online form.
Protect your home from sewer rats with a professionally installed rat blocker.
Call or Message Us
If you need urgent pest control, the fastest way to reach us is by phone or WhatsApp.
📞 Call Us
01438 870688 – Stevenage Office
01462 374030 – Hitchin Office
Client Reviews & Feedback
We are a small family run business of dedicated Pest Controllers that take great pride in our work.
Where we work
- Stevenage
- Hitchin
- Letchworth
- Baldock
- Welwyn Garden city
- Ware
- Hertford
Where we work (Bird control)
- Hertfordshire
- Bedfordshire
- Cambridgeshire
- Essex
- Buckinghamshire
- Northamptonshire
- Peterborough
- Greater London
- Kent
