The filters in this kit have a flat bottom and connect on the top. PWC-400FP Replacement filter pack includes;
1 - flat-bottom sediment filter
1 - flat-bottom carbon filter
Change filters every 6 months.
Vertex – OLD STYLE Replacement Filter Pack for PWC-400 Coolers
DO NOT PURCHASE THESE FILTERS unless your PWC-400 cooler was purchased BEFORE April 2008.