This Ingersoll Rand Air-Operated Poly PTFE Double Diaphragm Pump is a compact 1/2in. polypropylene pump that delivers big performance in a small package. The versatile, compact, heavy-duty design enables usage in a variety of locations including limited spaces. 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. Rated for typical fluids: antifreeze, ATF, light viscosity petroleum, synthetic oil and more. 5-year limited warranty.