THERMO 44002 44002 ROUND LINESET WALL THIMBLE Thermo Mfg. 2-7/8" Round Through-the-Wall Line Set Thimble Kit (#44002) Type: Round; Diameter: 2-7/8"; Fits: Up to 12" wall sizes Creates a permanent, air-tight seal through walls Temporary plug keeps out air, insects and other pests For new construction or retrofit; No ugly holes to patch