Anti-wicking block prevents water incursion; Oil Lifter extends seal life by ten times; Dual Inside Mechanical Seal with silicon carbide faces provides longer operational life of any seal available; V-Ring Seal design protects mechanical seal from abrasive particles; Built-in larger shaft mounted agitator suspends solids; High Chromium Iron impeller; Ductile Iron Casing; 3/4 HP motor; larger than HS2.4S; Easy pump end disassembly by removing only 3 nuts