The Enduraplas 400 Gallon White Horizontal Sump Bottom Leg Tank ships ready to mount on its integrated steel frame, sitting on a 74-inch by 46-inch footprint (length by width) at 45 inches tall - a low center of gravity that suits transport, skid, or applicator-trailer mounting. It is a horizontal leg tank molded in Natural White polyethylene with a 1.9 specific gravity rating, meaning it is engineered to carry contents up to 1.9 times the density of water, a heavier-duty rating than the 1.5 SG common on general-purpose poly tanks.
Will it handle your load
Filled with plain water this 400-gallon tank carries about 3,336 pounds, and at its full 1.9 SG rating it is rated to hold up to 6,338 pounds of contents - the frame supports that full rated load. Use both numbers when you size a trailer, applicator skid, or transport frame, because the rating headroom is what lets this tank carry dense fertilizer blends and heavy chemical solutions that would exceed a standard 1.5 SG horizontal tank. Note that 1.9 SG is the top weight rating offered on this footprint; if you are hauling something denser than 1.9 times water, call us at 866-418-1777 rather than assuming a higher-rated drop-in exists. Run the numbers against your rig with the Tank Sizing Calculator and the Tank Sizing Guide before you commit to a mount. One thing to confirm before order: outlet and bulkhead fittings are not specified in our data for this unit, so do not assume the sump-bottom geometry includes plumbing - verify the drain and fitting package with us first.
Chemical compatibility
This tank carries a 1.9 SG rating. The resin grade is listed as HDLPE but unconfirmed - confirm HDLPE versus XLPE (cross-linked) with us before putting this tank into chemical service, because the wall resin determines what it can safely hold. The list below pairs each chemical with the fitting and gasket materials the OEM chemical-resistance chart specifies; on each linked page, that fitting and gasket spec is the gate, not the tank wall alone. Verified compatible at the noted concentrations: acetic acid (60%, PP/PVC fittings, EPDM gaskets), aluminum sulfate (50%, PVC, EPDM), calcium chloride (40%, PVC, EPDM), DEF (32.5%, 316SS fittings, EPDM), ethylene glycol (100%, PVC, EPDM), ferric chloride (50%, PVC, EPDM), ferric sulfate (60%, PVC, EPDM), ferrous sulfate (20%, PVC, EPDM), hydrochloric acid (37%, PVC, Viton), hydrofluoric acid (48%, PP/PVC, Viton), hydrofluosilicic acid (26%, PP/PVC, Viton), hydrogen peroxide (50%, PVC, Viton), magnesium chloride (30%, PVC, EPDM), peracetic acid (30%, 316SS, Aflas), phosphoric acid (85%, PVC, Viton), polyaluminum chloride (PVC, EPDM), potassium carbonate (50%, PVC, EPDM), potassium hydroxide (saturated, PVC, EPDM), propylene glycol (PP/316SS, EPDM), sodium bisulfate (PVC/PP, EPDM), sodium bisulfite (PVC/PP, EPDM), sodium carbonate (30%, PVC, EPDM), sodium hypochlorite (below 16.5%, PVC, Viton), sodium thiosulfate (40%, PVC, EPDM), sulfuric acid (98%, CPVC, Viton), urea solution (50%, PP/PVC, EPDM), zinc orthophosphate (PP/316SS, EPDM), and ozonated water (up to 10 PPM, PVC, EPDM). Always check the OEM chemical-resistance chart for your exact concentration and temperature, and start at our chemical compatibility guide.
The mistake to avoid
The number one error on a tank like this is treating the 1.9 SG rating as license to run any aggressive chemical without confirming the resin and the fittings. The rating covers weight, not chemical attack - and several of the chemicals above demand Viton or Aflas gaskets and CPVC or 316SS fittings, not the default EPDM. Sodium hypochlorite must stay below 16.5%, sulfuric acid at 98% needs CPVC, and peracetic acid wants 316SS with Aflas. The fitting and gasket called out on each chemical's page is the gate to clear - match your plumbing and seals to it, and confirm HDLPE versus XLPE for your specific chemical before filling.
This tank ships LTL freight from the Enduraplas plant in Neche, ND, quoted live to your ZIP - get an exact number with the Freight Cost Estimator or call 866-418-1777. For mounting and DOT-scope guidance, see our guides on applicator and leg tanks for fertilizer, portable utility tanks and the 49 CFR 173.5 farm exemption, and fertilizer-blend tank stratification.
