The Multi-Seam Expansion Kit for the Stealth Seamer™ enables the setting of two seams at the same time (up to 14 feet apart), or "chain linking" of four seam setters for one large seam, all with the use of one pump. The expansion kit includes two seam setters, carrying/storage case, 15' of extension tube with adapters, four thumb pump plungers, and four cup covers... all in one convenient package.