When you work on heating, ventilation, and air conditioning (HVAC) systems, small parts can make a big difference. One of those small but very important parts is the pipe nipple. A pipe nipple is a short piece of pipe with threads on both ends. It helps connect fittings, valves, and equipment in HVAC piping. Even though pipe nipples look simple, using the wrong type or installing them badly can cause leaks, noise, and expensive repairs. In this guide, we share easy best pract