Powered by Pro-Flo® SHIFT Air Distribution System (ADS), Stallion® Original™ submersible, self-priming, and shear-sensitive pumps feature shock-absorbing polyurethane screen base, large internal clearance and flow-through design, integrated suction strainer, and altered ball/seat check valve assembly. All sizes – 1 ½ in. (PS4), 2 in. (PS8), and 3 in. (PS15) – handle pressures to 125 psi and are available in aluminum or ductile iron. Depending on model, flow rates range from 81–202 gpm.