View cart “Prescription Bifocal Lenses” has been added to your cart. #279 Smoke Spec (does not include lenses) The #279 Smoke Spec insert fits most full-facepiece respirators. Click here for the Smoke Spec Insert Guide for examples of compatible masks. Click here for insert specs. Instruction Page. #279 Smoke Spec quantity Add to cart Category: Uncategorized Related products Prescription Single Vision LensesPer Pair – Free USPS First Class Shipping – $65.00 Add to cart #411TS Smoke SpecThe 411TS Smoke Spec can be used in the Scott AV2000 respirator mask. Attaches to mask via nut and bolt assembly. Click here for frame specs. $38.95 Add to cart