The pro’s have some really neat tools for applying pesticide products into some of the most impossible spots. Their sprayers can shoot a fine pin stream for the smallest crack or crevice and with one turn of the head they can cover a whole carpet area for fleas in just a few short minutes. They have void and sub slab injectors, fog and dusting machines, tubes in the wall injection and can even generate large volumes of foam in almost any consistency.
For the average do it yourself pest control person your stuck with what you can buy at a big box or U kill it store. There is one tool you can enjoy the benefits of however without breaking the bank and it will enhance your void treatments tremendously.
The 4 way fogger is a straw attachment for aerosols that enables the spray to go in 4 different directions at the same time. It is not meant for ‘open air’ treatment but rather it’s used to treat voids in the wall. The reason it is so valuable is because instead of shooting only straight it sends the lethal insecticide 4 ways to fill the void and gives insects like roaches no place to hide. Until today only a pro could treat a void like this, now you can too.
How to make a 4 way fogger
To make a 4 way fogger you’ll need an aerosol product of course but you’ll need one that comes with a straw tip. It’s important to note that once you have altered the straw tip and are satisfied with your spray pattern you might want to buy another can with a straw tip for any ‘straight’ shooting. Also if the tip doesn’t come out quite perfect you can simply cut the altered end off with a razor knife and you’ll have your original straw back, just a 1/8 of an or so shorter. Try to create your new 4 way as close to the end as possible so if you do need to cut it back, you won’t drastically shorten it.
First you must remove the straw from the cap. Never try this with it still attached to the can.
To start you need to cap the end of the straw and the easiest way is to use a lighter 
and melt the end shut. It doesn’t take but a few seconds and while it’s hot tap the melting end on a flat surface to ensure it completely blocks the end hole.
Next, with a pair of pliers grasp the straw close to the capped end and so it’s laying long ways and place it on a hard surface. (not one you care about getting scratched) Using a razor knife or sharp razor blade push the corner of the blade into the straw until you poke through to the other side. Take your time and use a rocking motion and the sharp blade should go through pretty easily. Now you may need to turn the straw over and slightly push through the small pin point hole on that side. There you’ve now created a 2 way fogger.
To get the other slits you simply repeat the process 1/4 way around from the first holes but you’ll need to go just above or below them. The reason is that yes you are cutting but there is plastic slivers being pushed inward and that may block or alter your pattern. Also too many slits in one spot may weaken the straw and it could break on your final cut.
The end result may vary somewhat and perhaps not every stream will be as good but if all you manage is 3 healthy holes you can just rotate the can when you are injecting the voids to make up the difference.
Where to use your fogger
As stated this is a void injecting tool and works great in places like plumbing voids under the sink, 
cable wire outlets, hollow doors, motor housing, small enclosed areas, bath traps and the list goes on. Never use any aerosol near open flames or pilot lights and I’d be careful with electrical outlets.
Oh and make sure that when your spray can is empty you save the straw so you can use it again and again. I mean if you threw it away, how would you treat the voids in your life?
