Flange Kits, Bolt Hole Size 2.5 in, Compatible Pipe Size 3 in, Compatible with Brand Armstrong, Compatible with Series E.2, S&H, Compatible with Series Family E.2, 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 E28.2HT, E29.2HT, E30.2HT – 3 In., E32.2HT – 3 In., E33.2HT – 3 In., S-45, S-46, S-57, Compatible with Pump Type In-Line Circulating Pumps, Flange Gasket Material EPDM