2 PCS 4.80/4.00-8 Inner TubesMade of high quality and sturdy rubber, these inner tubes are very durable and ideal for home, business and commercial, industrial use.Compatible models for referenceTyre 4 .80/4.00-8. 15.5 Tire Diameter for 15.5 Tire / Pneumatic Wheels - Perfect for Hand Carts, Carts, Lawn Mowers, Wheelbarrows, Generators, Utility Carts with wheels of 16. Mounts on an 8 rim.Perfect fit for: TIRES / WHEELS 4.80 / 4.00-8: Replacement tubes for 4.80 / 4.00-8 tires / wheels (15.5 outside diameter). Also measured as 4.80 4.00-8, 4.8 4.0-8, 480/400-8, 4.80-8, 4.8-4-8, 480400-8, 4.8/4 ,0-8, 4.00/4.80, 4.80-4.00-8 inch Note: MAX INFLATION 30 PSI. Inflate only with hand pump to avoid over inflation. Not designed for street or highway use. Universal causes of tire and tube failures: A single puncture or small hole usually comes from a thorn, wire or small nail. These may be repairable. Check the tire as well for thorn etc., then remove it. Double splits are usually the result of a rim pinch. The tube was pinched between the rim and an object in the road/trail. Increase air pressure or use wider tires. Rash causing a large jagged hole. These are generally not repairable. Also check for damage to tires and rims. A cut or tear for a long time may also indicate a tire explosion. As a rule, it's not fixable. Use caution when stepping into a tire during installation. Inspect Before Installation Inspect exterior of tread for nails, pieces of glass, thorns, or other protruding objects. Visually inspect the inside of the tire casing for nails, glass or debris. Wipe the inside of the case clean with a rag, then carefully feel inside with your fingers. Be careful if using a tire iron. The tire lever is very easy to punch a hole in your inner tube. Inspect both sides of the tire for bead seating and for any signs of the inner tube coming out. Reinstall if necessary. How to inspect the hole on the inner tube? Inspect for air leaks by holding the inner tube close to the sensitive skin of your lips or near your ear. Move the tube around its circumference. If these steps don't work, push the inner tube into water and watch for bubbles in the hole.