This Vibrant 4 Ply Reinforced Silicone Straight Hose Coupling is 1.5in I.D. (inner diameter) and 3in long. It is made of a strong and durable 4 ply reinforced silicone material, making it ideal for a variety of applications. The black color provides a sleek and professional look. It is designed to provide a secure connection between two hoses, and is suitable for use in high pressure and temperature applications.