10 pack of Black 3/8" barbed straight fittings. xGarden Brand. Use these quality connectors for your hydroponic and drip irrigation systems. Can also be used for air tubing. Connect any barbed straight, elbow, or tee connector to standard 3/8" ID (Inner Diameter) tubing for an airtight or watertight fit. PP (Polypropylene) Plastic is food safe, highly durable and resistant to degradation.