As I'm sure many of you are aware and most likely long ago complied with, Rotax issued a Service Bulletin (SB-912-043-R2 and (SB-914-029-RB) back in November 2006 which in part called for replacing the radiator cap part no. 822075 (0.9 bar) (13 psi) with a new radiator cap part no. 922070 (1.2 bar) (18 psi).
Perhaps you just wish to replace you cap because its been 10 years and it does have a rubber seal. You can buy one from CPS for $84 or Lockwood for $70. Or much better still for about 1/2 that cost you can buy the same cap online from a BMW motorcycle parts dealer. As you might have seen on the Matronics email list, The single cylinder 4-stroke BMW F-650 liquid cooled engine (1997-2000) was made by Rotax and uses the same 1.2 bar cap.
Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.
Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.