Yes, you can go to a big box store and buy a cheap transition to connect the dryer to the pipe in the wall. But remember that the materials used are not built to the highest level of fire resistance. Many times, they will combust and can not contain a fire inside for very long. Installing an ultra-high-quality fire-resistant transition will help prevent a fire from spreading out of the vent into your home. Also, a high-quality transition will reduce air resistance and give you a faster airspeed. This means your clothes dryer faster, and you will save power and money. Also, quicker dryer times mean less time doing laundry and more time doing what you enjoy!