Meeco Mfg. Co., Inc. 102 Thermoseal Rope 3/8"x75' thermoseal rope A 1000 F. rope designed for use in forming airtight, compressible seals around stove, fireplace, an Made of the highest quality braided fiberglass, this rope is resilient, pliable, and readily conform To ensure peak operating efficiency, door seal should be replaced on an annual basis 3/8" x 75' spool