DESIGNED FOR 20″ PENTAIR PENTEK BIG BLUE FILTER HOUSINGS and can replace any 20″ x 4.5″ carbon filter. Extruded Carbon Block is another great pre-filter choice (Pentair Pentek RFC-20BB or NCP-20BB filter).
*READ* CANADA SHIP Pentek GAC-20BB Granular Activated Carbon Filter 4.5» x 20»
Only one black rubber washer. Not sure if it needed two?.
