There are plenty of ways to accessorize your air tool kit. Some of your more immediate needs will include an air pressure gauge, spare connectors and a replacement hose. You can also purchase kits that include plenty of small items you may not think of right away, but can't live without once the originals have gone bad. Air tool accessory kits often include replacement air guns, water separators, air regulators, and much more. One important thing to remember when buying your accessories is your compressor's PSI rating. Many accessory kits are labelled with the pressure rating of the equipment. Match the PSI rating of the accessories with that of your compressor.