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The color gives tech officials and scrutineers a quick visual check without the need to measure the gasket. This is usually required to be legal especially national events, but the rules are not as strict on the club and local levels of racing. In those cases, you can use the standard 16B-223 .020" Fuel Pump Gasket or, if allowed, the 219 .040" Fuel Pump Gasket. Check with your racing organization or club's rules and officials before ordering.
16B-407 Tillotson Orange/Red Spec Fuel Pump Gasket fits all Standard Volume(Single Stack, Gas)HL, HR, HW, HM, HX, HB carburetors but is mandated by the HW-27, HW-31, HW-33 for IAME Class Engines