Circulating Pump Coupler, Compatible with Brand Bell and Gossett, Compatible with Grainger Part Number 2P611, 3P721, 3P724, 3P733, 4RD13, 4RD14, Compatible with Manufacturer Model Number 105089, 105097, 501203, Compatible with Series PD37T, Compatible with Series Family PD37T, Coupling Material Cast Iron, Compatible with Pump Type In-Line Circulating Pumps, Manufacturers Warranty Length 1 yr.