Sterling Vaccuum Filters & Accessories For 4510W, 5013W, 4520W, 4520S & Porter Pro Disposable Paper Filter Bag (4510W, 5013W, 4520W, 4520S) 122-3200-14 Cloth Filter Bag (4510W, 4520W, 4520S) 124-7190-14 Disposable Filter Bag (Porter Pro) 122-3210-14 Replacement Squeegee Blades (4520S) 124-7224-14