https://www.ebay.com/sch/i.html?_nkw=3M+Bio+Conversion+Kit+L&_sacat=0&_dmd=2

3M Bio Conversion Kit,L

Regular price
$302.00
Sale price
$213.00

Bio Conversion Kit, For Use With BE Turbo Assembly, Includes Head Cover, White, Large, (3) QC, Breathing Tube, (3) High Efficiency Filter, Material Tychem(R) QC, Clear Acetate, Size L, Standards NIOSH Approval TC-21C-0575