A customer has had rats entering her house via an external drain. If you look on the photo the outlet pipe leads in to the house. This is how the rat has gained entry to the property. If you look in the drain channel you can see where it’s droppings have been washed out of the pipe. To control this rat baits have been suspended in the drain. This will protect them from water damage whilst the rat feeds on them. When the control treatment is over a rodent stop valve will be fitted to the drain.