This Ingersoll Rand Air-Operated Aluminum Double Diaphragm Pump is a compact 1/2in. metallic pump that features big performance in a small package. The compact, heavy-duty design enables usage in versatile locations including limited space. An unbalanced valve design helps to eliminate valve centering and pump stall-out. The Simul-Shift valve provides an ultra-positive, reliable shift signal for maximum efficiency. 5-year limited warranty.