⅝ inch is the most common and a good diameter for adequate water flow and pressure. Garden hoses also come in ½ and ¾-inch diameters. The larger the diameter, the more water the hose can hold. ½ and ¾-inch diameter hoses are best for light tasks such as watering hanging baskets and small gardens.
Air & Multipurpose hoses are categorized into three subgroups, general, heavy duty, and push-on hose, and will typically have a Class A, Class B or Class C rating, based on the degree of oil resistance.