Carvin SERIE'S FEATURESRing-Lok access to filter element for "tool-free" servicing.Built-in tooth on Ring-Lok allows you to easily disengage lid.Safety tab lock assures proper installation and safe operation.Easily convertible from D.E. filter to Sherlok Element filter.Anchor kit included to secure tank to base or pad.Surestitch grids with Seam-Lok stitching offer optimum seam strength and wear. Straight, vertical design reduces bridging and provides more uniform flow du