Rat Blockers

Keeping Unwanted Guests Out

Did you know that the most common way rats enter a property is through the drainage system? Rats are excellent swimmers and can navigate U-bends, swim up pipes, and even surface in toilets.

If you are hearing scratching in the walls or finding evidence of rodents but can’t find a hole in your brickwork, the drains are the likely culprit.

In simple terms: A Rat Blocker is a one-way steel gate that fits inside your pipe. It lets wastewater flow out, but stops rats from coming in.

rat entering through pipe

Why Do I Need a Rat Blocker?

Pest control can put down bait, but that only deals with the rats that are already there. It doesn’t stop new ones arriving. Rats view your drainage pipes as a superhighway into your home.

You should consider a rat blocker if:

  • You have had a recent infestation: And you want to make sure it never happens again.
  • You hear scratching: Noises coming from behind walls or under floors are often caused by rats in the pipes.
  • You are a landlord: You have a duty to keep your property pest-free for tenants.
  • You run a food business: Restaurants and cafes need to protect their hygiene rating.

How It Works

It is a simple but brilliant device. We install a stainless steel unit inside your drain pipe.

  1. Water flows out: When you flush a toilet or run a tap, the force of the water opens the flap, letting waste pass through easily.
  2. Rats stay out: If a rat tries to push up from the sewer, the flap locks shut. They cannot push through it and are forced to turn back.

The best part? It is non-toxic, humane, and requires no electricity or maintenance.

How We Install It

We don’t need to dig up your garden to fit one. We usually do it through a manhole.

1. The Camera Check (CCTV) – Before we fit anything, we send a camera down the drain. We need to check that the pipe is in good condition. If the pipe is collapsed or full of roots, a blocker won’t fit, and we will advise you on the necessary repair instead.

2. Selecting the Size – Most homes use 100mm (4 inch) or 150mm (6 inch) pipes. We select the correct size blocker for your system to ensure a snug, rat-proof fit.

3. Installation & Testing – We lower the device into the pipe from the manhole and lock it in place. We then test it to make sure the flap opens freely for water but stays firm against pressure from the other side.

Rat peeking head in pipe

The Benefits to You

  • Immediate Protection: As soon as it is fitted, the entry route is closed.
  • No Poison: Safe for pets and the environment as it doesn’t use chemicals.
  • Cost-Effective: A one-off installation is cheaper than repeated visits from pest control.
  • Peace of Mind: You can sleep soundly knowing your home is sealed against intruders.

Stop rats at the source. Ask ASL about installing a Rat Blocker today.

When installed correctly, rat blockers stop rodent access at the point where most infestations begin — the drainage system.

Areas we cover

Surrey, Hampshire, Berkshire, West Sussex and South West London

The ASL Limited HQ is in Guildford, but our operating area is the whole of Surrey and parts of Berkshire, Hampshire, West Sussex and South West London.

Map showing areas we cover in Sussex, Hampshire, Berkshire, West Sussex and South West London

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Contact Us

Get in touch today

You can call us on 0800 181 684, email info@asllimited.co.uk or use the form below: