1 to 3-inches w.c. (2 to 7mbar) Brown*** 3 to 11-inches w.c. (7 to 27mbar) Iridite*** 6.5-inches w.c. to 1.2 psig (16mbar to 0,08bar)Green*** 0.7 to 2psig (0,05 to 0,14bar) Blue*** 1 to 3.2psig (0,07 to 0,22bar) Orange*** 2 to 5.5psig (0,14 to 0,38bar)Metallic with Green stripe*** 4 to 10psig (0,28 to 0,69 bar) Metallic (Silver)***