FAQs

How do i know i need a RATFLAP®?
You will benefit from the installation of a Ratflap® if you have a sewer rat (ratus norvegicus) problem inside your building and there are no visible entry holes in your house above ground. The sewer rat is entering and leaving daily unseen to feed in the main sewer via a damaged pipe. Be sure you have correctly identified the species of rat infesting your property. The Ratflap® is not a suitable solution to an infestation of the species, Black Rat (rattus rattus).

What size RATFLAP® do i order?
Most modern plastic sewer pipes that service your property are of a standard size in inches. If you do not know the exact size of your pipe do not order a RATFLAP® until you have found out your size. Ask at your local hardware, plumbers merchant or local authority drainage dept.

Older clay pipework may not be a consistent size. Most pipe sizes are available but odd sizes may need to be made specially and will probably cost more than the standard. The Ratflap® does not so far require a certificate of compliance with any local city authority as it does not form a part of the structure of the sewer system. The RATFLAP® does not place any stress on pipes and will not damage old delicate clay pipes during installation. The Ratflap® is not suitable for chambers deeper than 10 feet.

How do i install the RATFLAP®?
Installation is very simple, just follow the online instructions but if you are unsure of the mechanics of sewer pipes ask for help from a competent person as installing the RATFLAP® in the wrong place can block your pipe at worst or not solve your rat problem.

Where do i place the RATFLAP® to solve my rat problem?
The Ratflap® must be only installed on your own property, not in the public sewer system. The latest version of Ratflap® can be placed into a downstream or upstream position without removing any hardware, just make sure the arrow on top of the Ratflap® is pointing in the same direction that the wastewater flows inside your sewer. If you are unable to install it yourself seek help from a competent person.

How often do i check the RATFLAP®?
The RATFLAP® is of very simple design and requires no maintenance once installed, ie it is a “fit and forget” unit. The clever design means no edges are presented to an intruding sewer rat, they cannot gnaw away at the device. The Ratflap® remains in place in the sewer, it is made of acid resistant stainless steel and will continue working for decades. If removed the rat problem will probably return in a matter of days unless the reason for sewer rat entry ie a damaged pipe has been sourced and fixed. Despite what people like to believe or have heard from their friends, the maximum species weight of a sewer rat or (Rattus Norvegicus) is a very rare or 1.1 lbs for a large alpha male, most sewer rats are only half this weight, therefore a sewer rat cannot exert the force onto the RATFLAP® to dislodge it so the only way it can be moved is by human hand.

Will the RATFLAP® cause pipe blockages?
Your sewer pipe may have been in the past prone to blockages, the Ratflap® will not change this situation. The RATFLAP® has never caused a blockage during tests, if some unsuspecting person in the future attempts to “rod” the sewer from a different location along the pipe, the RATFLAP® will be dislodged upon retracting the rods but can then be relocated into the pipe. Once installed in your sewer it will go on working for decades, this is because of its uncomplicated 2 piece design. Manufactured from high-quality acid resistant 300 series stainless steel, the design is so sleek that it provides no resistance to the flow of waste and allows 98.5% of the volume of the pipe to be utilised for waste flow.

Will a rat leave my house when the RATFLAP® is installed, will I have to poison or trap it?
Sewer rats almost always leave a house on a daily basis to feed as no food exists in your walls and attic, therefore the rat can pass through the Ratflap® device but cannot return, the only issue that may arise is if your rat has nested and gave birth to pups which remain in your house, in this rare case they will have to be trapped using conventional rat traps as they may be too young to leave.