Circulating Pump Coupler, Compatible with Brand Bell and Gossett, Compatible with Grainger Part Number 4RC97, 4RC99, Compatible with Manufacturer Model Number 102218, 102222, Compatible with Series HD3, LD3, Compatible with Series Family HD3, LD3, Coupling Material Cast Iron, Compatible with Pump Type In-Line Circulating Pumps, Includes -, Manufacturers Warranty Length 1 yr.