www.thedriller.com/articles/89773-flint-walling-upgrades-sp-centrifugal-pumps

Both models include and easy access drain plug, 2-inch suction pipe and 1-1/2-inch discharge pipe.
Source: Flint & Walling
Flint & Walling Upgrades SP Centrifugal Pumps
SP15P1, SP20P1 Internally Enhanced
October 30, 2014
Flint & Walling Inc. has enhanced performance for its SP15P1 and SP20 P1 centrifugal pumps.
The pumps have been internally upgraded, improving their overall performance.
The models are designed for irrigation, water transfer and lawn sprinkling.
Flint & Walling, established in 1866, builds a variety of pumps and pump products at the company’s facility in Kandallville, Ind. For more information, call 800-345-9422, visit www.flintandwalling.com or email tech@flintandwalling.com.