That's what it looked like. I guess if you're comfortable with the "hazard" of it coming open in a rearender, you don't need the twist cap. I ass/u/me the twist cap fits under the pop-open, but I'm not 100% sure...So do I understand this correctly: the safety issue is addressed by using the small, twist on cap under the pop-up cap? The kits I've seen for the '71 - '73 cars include both a press cap, and a small twist on cap. I use this car as a driver, so I don't want something I cannot use on the street.