Please make the o ring secured in place. Because it falls out very easily when installing onto the bike. Also, viewers asked to have the option to be able to buy extra filters without the whole housing 
Please make the o ring secured in place. Because it falls out very easily when installing onto the bike. Also, viewers asked to have the option to be able to buy extra filters without the whole housing
Please see if these two parts can be disassembled. If they are detachable, you can add thread glue and tighten them. If not, please try using a hair dryer to heat them and tighten them.
About the extra filters, if you need them, please contact us: support@nicecnc.com
and it will be listed in the near future.
Thanks for your question and suggestion.❤️
@Alice Lu the O-Ring I'm referencing is the grey one that goes on the big main housing. That sits on the filter and makes contact on the bike's receiving flange.
@Gimps Garage 👍Thanks for pointing out this problem, our team will provide a solution to this, and we will upgrade this product in the near future to make it easier to install. ❤️
