Flange Hardware Kits, Compatible with Brand Bell and Gossett, Compatible with Series NRF-22, NRF-33, NRF-36, PL-23, PL-30, PL-36, Compatible with Manufacturer Model Number PL-55, PL-55B, Flange Gasket Material Rubber, Includes (4) Capscrews, Gasket, (4) Nuts, Compatible with Series Family PL-55, PL-55B, Bolt Hole Size 0.44 in, Compatible with Pump Type In-Line Circulating Pumps, Flange Bolt Material Steel