Circulating Pump Coupler, Compatible with Brand Bell and Gossett, Compatible with Grainger Part Number 4RD15, 5YN70, 5YN73, 5YN75, Compatible with Manufacturer Model Number 105121, 613S, 617T, 623S, Compatible with Series E-60, PD-38, Compatible with Series Family E-60, PD-38, Coupling Material Cast Iron, Compatible with Pump Type In-Line Circulating Pumps, Manufacturers Warranty Length 1 yr.