Flange Kits, Bolt Hole Size 1.5 in, Compatible Pipe Size 1 in, Compatible with Brand Armstrong, Compatible with Series Astro 2, Design Envelope Compass, E.2, S&H, Compatible with Series Family Astro 2, Design Envelope Compass, E . 2, S&H, Flange to Pipe Connection Type FNPT, For Use With Potable Systems No, Flange Type Standard, Number of Mounting Holes 2