Generate low pressure up to 125 psi or draw a vacuum to -15 psi for calibrating low pressure or vacuum instrumentation. We offer a complete line of portable pneumatic cylinder hand pumps that let you dial in test pressures to within .01% of scale, giving you extreme accuracy even at very low pressures.

All Ralston pneumatic cylinder pump bodies are made from rugged anodized aluminium, so they’re lightweight, they don’t rust or corrode, and they can easily handle sand, sticks or other contaminants in the field. The modular design makes field maintenance quick and easy, and every pump includes our Quick-test hoses and adapters, for fast, easy connectivity without the need for thread tape.