Flange Hardware Kits, Compatible with Brand Armstrong, Compatible with Series Astro 2, E.2, S&H, Compatible with Manufacturer Model Number Astro 230CI, Astro 230CI-R, Astro 230SS, Astro 250CI, Astro 250CI-R, Astro 250SS, Compass H 20-20CI, Compass H 20-20SS, E12.2HT, E14.2HT, E15.2HT, E7.2HT, E8.2HT, E9.2HT, S-25, Flange Gasket Material Rubber, Includes Capscrews, Nuts, Compatible with Series Family Astro 2, E.2, S&H, Compatible with Pump Type In-Line Circulating Pumps