Lincoln Service Parts 1 › Lincoln Electric 9SM21923-3 CENTER PANEL INSULATION M21923-3 Lincoln Electric 9SM21923-3 CENTER PANEL INSULATION M21923-3 Sale Price: $24.45 Original Price: $28.12 CENTER PANEL INSULATION PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1 Add To Cart Added! CENTER PANEL INSULATION PURCHASE PRICE SHOWN IS FOR A QUANTITY OF 1