Circulating Pump Coupler, Compatible with Brand Bell and Gossett, Compatible with Grainger Part Number 312H67, 3CFE4, 42FK97, 42FK98, 42FL05, 4RD26, Compatible with Manufacturer Model Number 118473, 169228, 169229, 169230, 169231, 169232, 169233, Compatible with Series 60, Compatible with Series Family 60, Coupling Material Rubber, Steel, Compatible with Pump Type In-Line Circulating Pumps, Overall Diameter 2.06 in