2 PCS 4.80 / 4.00-8 air hosesMade of high-quality and robust rubber, these hoses are very durable and ideal for use in the home, at work and in industry.Compatible models for reference tires 4.80 / 4.00-8 . Tire diameter 15.5 for tires / pneumatic tires 15.5 - Perfect for handcarts, carts, lawn mowers, wheelbarrows, generators, commercial vehicles with 16 wheels. Is mounted on an 8 mm rim. Perfect fit for: TIRES / WHEELS 4.80 / 4.00-8: Replacement tubes for tires / wheels 4.80 / 4.00-8 (outer diameter 15.5). 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 inchNote:INFLATION MAX. 30 PSI. Inflate only with a hand pump to avoid overinflating. Not suitable for use on roads or highways.Universal causes of tire and tube failure:A single puncture or small hole is most often caused by a thorn, wire or small nail. These can be repaired. Check the tire for spikes etc. then pull it off. Double slits are usually the result of a pinched rim. The tube was caught between the rim and an object on the road/trail. Increase air pressure or use wider tires. Eruption causing a large, ragged hole. These usually cannot be repaired. Also check the tires and rims for damage. A cut or crack for a long time can also indicate a tire blowout. This usually cannot be repaired. Be careful when sitting in a tire during installation.Inspect before installationInspect the outside of the tread for nails, broken glass, thorns, or other protruding objects. Visually inspect the inside of the tire housing for nails, broken glass, or other foreign objects. Wipe the inside of the case with a cloth and carefully feel the inside with your fingers. Be careful when using a tire lever. It's very easy to drill a hole in your tube using a tire lever. Check both sides of the tire for bead seating and for signs that the tube has leaked. If necessary, reinsert the tube.How do I inspect the hole on the inner tube?Inspect the tube for air leaks by holding it close to the sensitive skin of your lips or close to your ear. Move the hose around its circumference. If these steps don't work, push the hose into the water and look for bubbles in the hole.