Never seen an orange or red ADBV that is nitrile. I'm betting those are both silicone ... burn baby, burn.I left the photos big on purpose-both filters have louvers, the Purolator One on top clearly has a bright orange ADBV, the Red Classic on the bottom has a lighter red ADBV that I'm not convinced is silicone (someday I'll cut one & do the burn test). In case there was any question, no cage, just louvers (that appear to be open BTW).
