IN THE BOX: One S220 Regin Smoke Pen with 3 refill wicks; Instructions. Search: S221 Regin Refill Wicks. Dense, White Smoke Trail for F. The Regin S220 Smoke Pen generates a thin, dense, white smoke trail perfect for locating the source of drafts and air leaks around windows, doors, outlets, ductwork, exhaust hoods, chimneys, water heaters, attics, eaves, foundations, slabs and sill plates.

IN THE BOX: One S220 Regin Smoke Pen with 3 refill wicks; Instructions. Search: S221 Regin Refill Wicks. Dense, White Smoke Trail for F. The Regin S220 Smoke Pen generates a thin, dense, white smoke trail perfect for locating the source of drafts and air leaks around windows, doors, outlets, ductwork, exhaust hoods, chimneys, water heaters, attics, eaves, foundations, slabs and sill plates.