It is very interesting to feel an airtight suit or a drysuit close to the body with a vaccuum effect. Some people use a vaccuum cleaner but what I find fun is to use a tube connected to the air intake of a gasmask. While your breathe wearing the suit, you gradually pump the air inside naturally.
To be able to connect to the Trellchem a standard gasmask tube, I need an adapter. By standard I mean a tube with connectors following the STANAG 4155 standard (also called 40mm NATO Thread).
The trellchem has an air exhaust port that is fastened into a 25mm hole. I designed an adapter to replace it.
Version 1
Version 2
This adapter worked fine, but eventually when I disconnect the tube, all the air comes back in the suit at once. I designed a second adapter with a checkvalve so that the suits stays airtight.
