cap comes with two different size o-rings (for various size fuel tank spouts). unit also has a rubber tether (connects to DEF spout).

I have been using H&R Block's software (Deluxe version) for over 10 years and really prefer it to TurboTax which I tried on 2 occasions (2000 & 2006). For those with investments, TurboTax pushes their Premium version which is really pricey compared to H&R Block's Deluxe version which has all that I need. Not only is it less expensive, but I think it is also easier to use. Both programs seem to want to talk you into an upgrade, a bit annoying but easy to skip over. From reading it appears that TurboTax may be better at importing investment info, back in 06 this was true in that TurboTax accepted more import formats. I found that I had to check it over anyway with both programs for accuracy as both made mistakes.