The FIT line of air-operated, double-diaphragm pumps from Wilden Pump & Engineering are designed to drop into an existing plumbing footprint. No plumbing rebuilds are required. Re-engineered fluid paths increase flow rates to 54 percent compared to current Wilden models. Pumps are available with the Pro-Flo X or Pro-Flo SHIFT air distribution system. 909/422-1730; www.wildenpump.com.