The Enduraplas 400 Gallon Black Horizontal Sump Bottom Leg Tank (SKU THD00400B) is a 400-gallon polyethylene horizontal leg tank built for transport and field use. The black resin and sump-bottom design let you mount it on a trailer or skid, fill it, haul it, and drain it down to the low point without leaving product behind. It measures 74 inches long by 46 inches wide by 42 inches tall, with a 46.0 x 74.0 inch footprint that sits stable on a flat deck. Empty handling is easy; loaded handling is not, so size your trailer and tie-downs to the loaded numbers below.
Will it work for your job?
This is a true horizontal leg tank, not a stationary vertical, so it is meant to be moved with liquid in it. Full of water (specific gravity 1.0), the contents weigh about 3,336 lb. The tank carries a 1.9 specific gravity rating, which means it is engineered to hold denser liquids up to roughly 6,338 lb of rated contents weight at that maximum density. That 1.9 rating is the density ceiling: 6,338 lb is about 1.9 times the 3,336 lb water fill, so the tank handles liquids up to 1.9 times water density. On the trailer, the 46 x 74 inch footprint needs at least that much clear deck plus tie-down clearance, and you should plan axle capacity and strapping around the loaded weights, not the empty shell. If you are unsure whether 400 gallons matches your application volume, run the numbers through the Tank Sizing Calculator or read the Tank Sizing Guide before you commit. For DOT classification and roadability questions on hauling fertilizer and utility liquids, the guide on applicator and leg tanks for fertilizer and the farm-fleet agricultural exemption breakdown are worth reading first. Call 866-418-1777 to confirm the fitting and port configuration before you order.
Chemical compatibility
This is a polyethylene tank rated at 1.9 specific gravity, so it has the density headroom for many heavy industrial liquids. Our reference data lists the resin as HDLPE, but that grade is unconfirmed, so confirm HDLPE versus XLPE before placing the tank in chemical service. Always match fitting and gasket materials to the chemical, and verify against the OEM chemical-resistance chart for your exact concentration and temperature. Compatible chemicals from our reference data include: Acetic Acid (60%, PP/PVC fittings, EPDM gaskets), Aluminum Sulfate (50%, PVC, EPDM), Calcium Chloride (40%, PVC, EPDM), DEF (32.5%, 316SS fittings, EPDM gaskets), 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 (under 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). Note the gasket split in this data: routine salts, glycols, DEF, and urea run on EPDM, but the oxidizers and strong acids (hydrochloric, hydrofluoric, hydrofluosilicic, hydrogen peroxide, phosphoric, sodium hypochlorite, sulfuric) require Viton, and peracetic acid requires Aflas with 316SS fittings. A handful of services also step up from default PVC: DEF, peracetic acid, propylene glycol, and zinc orthophosphate call for 316SS, and 98% sulfuric acid calls for CPVC, so order those fittings accordingly. Concentration and temperature change the answer, so confirm each chemical on its dedicated page and the full chemical compatibility reference before ordering fittings.
Hauling DEF, glycol, and water-treatment loads
Because this is a horizontal tank on legs, it is a natural fit for mobile DEF, glycol, and water-treatment transfer where the load moves with the truck. For dense fertilizer blends carried in a tank like this, layering and salting-out can throw your spreader off-spec, so the fertilizer-blend stratification guide covers the mixing protocol and field checks that catch a stratified tank before it costs you. The common mistake on a 1.9-rated tank is treating the rating as a license to haul anything heavy without checking the chemical itself: a high SG rating handles density, but the resin still has to be compatible with the specific liquid and concentration, and the wrong gasket on an aggressive acid will fail long before the tank wall does.
Freight
This tank ships LTL freight from the Enduraplas plant in Neche, ND, quoted live to your ZIP code. Get an exact rate with the Freight Cost Estimator, or call 866-418-1777 and we will quote it and help you confirm the resin grade and fitting/port configuration for your haul.
