Polylok Risers / Lids Polylok Risers / Lids Polylok 6 X 24 RISER Polylok 12 X 20 RISER Polylok 20 x 6 RISER Polylok 24 RISER LID Polylok 12 diameter D Box Polylok 12X24 RISER Polylok 20 riser lid Polylok 20 24 RISER ADAPTER RING Polylok PL 68 HOUSING Polylok PL 68 1FILTER CARTRIDGE