Pipe nipples are small but important parts in many systems. They help connect pipes in heating, ventilation, air conditioning (HVAC), and fire protection setups. If you work in building or maintenance, you need to know about them. Here we will explain what pipe nipples are, how they are used, and why they matter. We will keep things simple and easy to understand. What Are Pipe Nipples? A pipe nipple is a short piece of pipe with threads on both ends. It joins two other pipes