Impeller, Compatible with Manufacturer Model Number 2ZWP1A, 2ZWP2A, 2ZWX4A, Compatible with Grainger Part Number 2ZWP1A, 2ZWP2A, 2ZWX4A, Impeller Design Semi-Open, Impeller Diameter 3 1/2 in, Impeller Material Cast Iron, Compatible with Pump Type Straight Centrifugal, Compatible with Brand Dayton, Includes Lock Nut