3M top of the line chemical mask. Works with multiple style filters. Full face. Model is a 7800S. Never used. Gas mask. Chemical mask, paint mask, dust, mold, soot, etc. Also for use in industrial. See link for 3M website.
https://www.3m.com/3M/en_US/p/d/v000057501/
Very durable. High performance.
$500 on Amazon , I bought this and never used it. Still in packaging.