Flange Kits Bolt Hole Size 1.5 in Compatible Pipe Size 3 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-45 S-46 S-55 S-57 Compatible with Pump Type In-Line Circulating Pumps Flange Gasket Material EPDM Flange Material Cast Iron Includes Flanges Hardware Kit