Flange Kits, Bolt Hole Size 1.75 in, Compatible Pipe Size 1 1/2 in, Compatible with Brand Armstrong, Compatible with Series Astro 2, E.2, S&H, Compatible with Series Family Astro 2, 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 1060-1.5, Astro 290CI, E10.2HT, E11.2HT, E13.2HT, E19.2HT, E21.2HT, E22.2HT, E23.2HT, E24.2HT, H-32, H-63, H-64, H-65