ALCON
Be aware that if you are using Carr Fasteners (who services Australasia) anodised brass snap domes that for the last 6 months they have been using a faulty coating process which will result in the them rusting.
We have been having a few issues with them and after some back and forth Carr have admitted that the they knew the coating was faulty but were selling them on regardless. We have now dropped Carr as a supplier and I advise anyone using their anodised fittings to check their fittings manufacturing dates.