Maglock Magnetic Forced Air Helmet Coupling System Safe Quick Connect and Detach (w/ Keychain) - MLA-0001
All you that have printed Mandalorian, Stormtrooper, or other enclosed helmets ought to install an airtight neck seal, and attach some respirator attachments and then donate them to your local hospital :
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How does the visor make an airtight seal on a space helmet? - Quora
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How does the visor make an airtight seal on a space helmet? - Quora
How does the visor make an airtight seal on a space helmet? - Quora
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Things that make you go hmm... What the point of using an airtight ring to hermetically
How does the visor make an airtight seal on a space helmet? - Quora