Pack of 2 pieces. Use these elbow fittings with Shurflo pumps to transition from NPT-M thread to 1/2" hose barb. We recommend using a small hose clamp (not included) for a more secure hose connection (just don't tighten clamp too much!) Nylon material has high structural/physical strength. It is great for water pumping and is generally resistant to extreme heat and cold. Avoid extreme exposure to UV radiation.