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!) Polycarbonate material is great for water pumping and fertilizer spraying and is UV resistant for outdoor use. Polycarbonate material is also more resistant to acidic compounds.