Koblenz U-310 Bag Assembly Zipper Vacuum #46-2940-8The zipper bag assembly on the Koblenz U 310 is a critical part of its filtration system when the bag or its zipper seal wears out, debris escapes and suction drops. This factory spec replacement restores the original fit and function. Genuine replacement bag assembly with zipper, built to Koblenz U 310 specifications Proper zipper seal maintains suction integrity and keeps fine dust contained Direct fit for the U 310 model no trimming or modification