Silicone rubber tube - will withstand repeated use and for visual inspection of fluids. Size: 8x10mm / 0.31'x0.39'(IDxOD); Length: 2.5M(8.2'); Wall Thickness: 1mm(0.04') Operating Temperature: -76 to +428F; Hardness: 65 Degree; Good electrical and weather ability properties - resists u.V., ozone, gases, and moisture. Silicone tubing - great for fluid handling, peristaltic pumps, siphoning, draining, aquaponics and water/oil change, etc. Note: Silicone tube is much softer than pvc tube or nylon tube