2 inner tubes 4.80/4.00-8. Made of high-quality solid rubber, these inner tubes are very durable and perfect for household, commercial, and industrial use. Compatible models for reference tire 4.80/4.00-8. 15.5 tire diameter for 15.5 pneumatic tires/wheels - Ideal for 16 wheel carts, wheelbarrows, lawnmowers, wheelbarrows, generators, utility carts. Mounted on 8 rims. > PERFECT FIT: 4.80/4.00-8 Tires/Wheels: Replacement inner tube for 4.80/4.00-8 tires/wheels (15.5 OD). 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, 4.080-4 inch ?? NOTE: Maximum air pressure is 30 PSI. Only inflate with a hand pump to avoid over-inflation. Not intended for roads or highways. Common causes of punctures in tires and tubes: Simple punctures or small holes are usually caused by punctures, wire, or small nails. These can be repaired. Check the tire for holes etc. and then remove them. Double punctures are usually the result of the rim hole pulling. The tube will be pinched between the rim and something on the road/path. Increase air pressure or use wider tires. Blowouts result in a large, uneven hole. These are usually irreparable. Also check tires and rims for damage. A longer cut or tear can also indicate a puncture. This cannot normally be repaired. Be careful when stepping on the tire during installation. Inspection before installation. Check the outside of the tread for nails, broken glass, thorns, or other protruding objects. Visually inspect the inside of the tire for nails, glass etc. debris. Wipe the inside of the casing with a cloth and then gently run your fingers over the inside. Be careful when using a tire iron. Tire removers are easy to drill into the tube. Check that the beads are on both sides of the tire and that there is no sign of the tube coming loose. Install if necessary. How to check the hole in the tube? Check for air leaks by holding the tube against the sensitive skin of your lips or ears. Move the tube around its circumference. If these steps do not work, immerse the tube in water and look for air bubbles in the hole.