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Lid gasket, sold by the foot. Lid gaskets wear down under constant vacuum pressure and eventually deform, which causes small vacuum leaks. If your pouches stop having all the air removed, the gasket may need replacing.
Compatibility: Promarks TC-520; SC-520; and double chamber models DC-530, DC-640-H, DC-650-H, DC-800, DC-860-H, DC-900.