Thermwell Products Co., Inc. pioneered the Do–It–Yourself weatherstripping business in the USA when it introduced the original consumer packaged product ––– Frost King Brand felt weatherstrip.
Today, Frost King is still the #1 brand of packaged weatherstripping, along with pipe/duct insulation, floor and carpet trim, and much more!
We own:
- Lever Manufacturing, a leading US designer and manufacturer of slitting, cutting, and winding machinery;
- Filmco Industries, which manufactures polyethylene for window insulation kits, sheeting, drop cloths, and trash bags;
- Mortite – the #1 brand of rope caulk;
- Seal–Rite industries – a maker of automotive weatherstrip products; and
- Regent Tape – a producer of consumer tapes.
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