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Hey all,
small upload here. The standard module contains a hole through the middle. I have designed a small oneway valve which can be fitted inside.
I will attach pictures shortly, however to get this to work, you will need to get something which works well as the valve. I used 1mm silicon sheeting which I have cut to size then hole punched one in the centre. I will provide visual instructions soon.
I know this is not much to go on, but I hope some of you can find a use.