Three-hole pipe

Imagine you have a straw with three holes in it. When you suck in through the first hole, water goes in and comes out of the second hole. When you suck in through the second hole, water comes in and goes out of the third hole. When you suck in through the third hole, water comes in and goes out of the first hole. A three-hole pipe works the same way, but instead of drinking water, it moves other liquids or gases through it. The holes are strategically placed to control the flow of the liquid or gas, making it very useful for things like plumbing or air conditioning systems.