Concrete Sumps Double Bottoms Earthen Pits & Ponds Leak Detectors Floor Areas Patch Kits Concrete Trenches Rigid PVC Waste Water Treatment Batten Strips (plastic) Horizontal Tanks... liners are equipped with grommets around the outside of the lip for a rope that is tightened to hold it in place, or stainless clips that attach to the lip of the tank. Liners... with weirs, sumps, steps, sloped floors, saddlebags are not obstacles to prevent the proper lining of a tank for you. For larger tanks with more complicated fixtures and attachments, we...