Flange Kits, Bolt Hole Size 2.25 in, Compatible Pipe Size 2 in, Compatible with Brand Armstrong, Compatible with Series S&H, Compatible with Series Family S&H, Flange to Pipe Connection Type FNPT, For Use With Potable Systems No, Flange Type Standard, Number of Mounting Holes 2, Compatible with Manufacturer Model Number S-35, Compatible with Pump Type In-Line Circulating Pumps, Flange Gasket Material EPDM, Flange Material Cast Iron, Includes Flanges, Hardware Kit