Your most economical choice in a variable speed stirrer/mixer. A rugged performer. Even a stalling load can't hurt the motor. All you need is compressed air at 30 to 90 psi and 2 cfm maximum. The 1/30 hp motor is explosion-proof with not heat build-up, safe even with flammables. A muffler assures quiet operation. Built-in needle valve gives precise speed control from dead slow to 1750 rpm. For volumes to 100 liters of low-viscosity fluids, lesser amounts at higher viscosities. Shaft is 12" x 5/16". Shipped with A310/2.5" impeller. Comes with universal clamp.