The 5cylinder colorado engines tend to all have a similar failure point. The 5th cylinder connecting rod bearing due to oil starvation. This line equalizes the pressure within the system gauranteeing the rear of the engine won't be last to get oiled. Check out our youtube videos on this topic.
https://youtu.be/JUEXlj5yoe4
https://youtu.be/uQ7zFM5ukEI
 
This kit comes with the necessary fittings and flex line to fit this onto your 4 5 and 6 cyl Atlas motor.