PCS 4.80/4.00-8 inner tubes. Made of high-quality, robust rubber, these inner tubes are very durable and ideal for home, professional, commercial, and industrial use. Compatible models for reference: 4.80/4.00-8 tires. Tire diameter 15.5 for 15.5 pneumatic tires/wheels – Perfect for hand trucks, trolleys, lawnmowers, wheelbarrows, generators, and utility carts with 16-inch wheels. Fits on an 8-inch rim. Perfect fit for: 4.80/4.00-8 tires/wheels: Replacement tubes for 4.80/4.00-8 tires/wheels (15.5-inch outer diameter). Also measured as 4.80 4.00-8, 4.8 4.0-8, 480/400-8, 4.80-8, 4.8-4-8, 480 400-8, 4.8/4.0-8, 4.00/4.80, 4.80-4.00-8 inches. Note: MAX INFLATION 30 PSI. Only inflate with a hand pump to avoid over-inflation. Not intended for road or highway use. Universal causes of tire and tube failure: A simple puncture or small hole usually comes from a thorn, wire, or small nail. These can be repaired. Check the tire for thorns etc. and then remove them. Double cracks are usually the result of a pinch flat. The tube was pinched between the rim and an object on the road/path. Increase air pressure or use wider tires. A blowout causes a large, uneven hole. These are usually not repairable. Also check tires and rims for damage. A long cut or tear can also indicate a tire explosion. This is usually not repairable. Be careful when mounting a tire during installation. Inspect before installation: Inspect the outside of the tread for nails, glass shards, thorns, or other protruding objects. Visually inspect the inside of the tire casing for nails, glass, or debris. Wipe the inside of the casing with a cloth and then gently feel the inside with your fingers. Be careful if you use a tire iron. The tire iron makes it very easy to puncture a hole in your inner tube. Inspect both sides of the tire for the tire bead and for signs of the inner tube coming out. Reinstall if necessary. How to inspect the hole in the inner tube? Inspect for air leaks by holding the inner tube near the sensitive skin of your lips or near your ear. Move the tube around its circumference. If these steps do not work, immerse the inner tube in water and look for bubbles in the hole.