Check out the Viair 2-port half-gallon air tank, a finely-welded tank with a 1/4" port on each side and an anti-corrosion coating. Rated for up to 150 PSI, it's ideal for smaller pneumatic applications.
As an important safety precaution, a safety blowoff valve should be installed with any air system. A safety blowoff valve is designed to keep the small compressed air tank system from over-pressurizing and to prevent damage to other components. It is suggested to use a safety blowoff valve with a PSI rating between 25-35 PSI higher than the maximum pressure of the pressure switch.
For example, 150 PSI systems require a 175 PSI safety blowoff and 120 PSI systems require a 150 PSI safety blowoff.
This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.