https://www.ebay.com/sch/i.html?_nkw=3M+Oh+Esd+142+Tr+3712N+5+He+Filter+For+Versaflo+Tr+300+Series+Papr+5&_sacat=0&_dmd=2

3M Oh & Esd 142-Tr-3712N-5 He Filter For Versaflo Tr-300 Series Papr 5

Regular price
$213.00
Sale price
$146.00

Features High efficiency particulate filter Convenient package size Easy to install The tr-3712n is a high efficiency (he) particulate filter for use with tr-300 series paprs.