I'm not sure what size air hose and garden hose I need? The size of hose you need depends upon your use and volume you are putting through the hose. Those who work professionally with air tools and need air volume will commonly use a 3/8” air hose with ¼ MPT ends. Those who don’t need a lot of volume use ¼” air hose with ¼ MPT ends. These are the two most common air hoses used. Less common is a 3/8” air hose with 3/8” MPT – we do carry this hose for those who need its features. The most common garden hose size is 5/8” because most homes can deliver enough volume and pressure to allow a sprinkler to be used with it. ½” garden hose is gaining in popularity as many people realize that a 5/8” hose may be overkill for them. If you have low pressure or don’t water large areas a ½” hose is probably right for you.