The Enduraplas 500 Gallon White Horizontal Sump Bottom Leg Tank ships with a frame, built for transport and mobile applicator work where a vertical tank would sit too tall and shift on the road. At 49 inches high, 57 inches wide and 80 inches long, it carries 500 gallons of natural white polyethylene rated to a 1.9 specific gravity, a high-density rating that opens this tank to heavy liquids well beyond plain water. If you are sizing a horizontal leg tank or comparing 500 gallon tank options, this Enduraplas unit fits common DOT non-roadable and farm-fleet use cases.
Will it work for your liquid?
The 1.9 specific gravity rating is the number that matters most here, and it is the heaviest-duty rating offered in this family, so there is no stronger step-up to size into. Full of water at 8.34 pounds per gallon, the tank holds roughly 4,170 pounds. Because the wall is rated to 1.9 SG, the maximum rated contents weight climbs to about 7,923 pounds, so dense fertilizer blends, brines and acids stay within the structural rating, provided the frame and your trailer are matched to that load. The footprint is 57.0 by 80.0 inches. One thing our data does not specify is the installed fitting and outlet configuration on the sump bottom, and the drain location is the whole point of that geometry, so confirm the outlet and any plumbed fittings by phone before ordering. Use our Tank Sizing Calculator and Tank Sizing Guide to confirm fit and weight against your trailer deck.
Chemical compatibility
This tank is polyethylene rated to 1.9 specific gravity. The resin is recorded as HDLPE with an open question mark in our data, so confirm whether your tank is HDLPE or XLPE with us before placing it into chemical service. That distinction mainly blocks the aggressive acid services such as sulfuric 98% and hydrochloric 37%, where crosslinked polyethylene is the usual choice; the salts, glycols and DEF that most applicator fleets haul are served by standard HDPE, so the resin question narrows to where it actually matters. Compatibility below is concentration- and temperature-specific, so verify your exact concentration and operating temperature before committing.
The following are listed as compatible at the noted concentrations, with the recommended fitting and gasket materials: Acetic Acid 60% (PP/PVC fittings, EPDM gaskets), Aluminum Sulfate 50% (PVC, EPDM), Calcium Chloride 40% (PVC, EPDM), DEF 32.5% (316SS, 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 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). Five of these, Polyaluminum Chloride, Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite and Zinc Orthophosphate, are listed without a verified concentration in our data, so confirm your strength before relying on the listing. For background on these listings, see our chemical compatibility resource.
The mistake to avoid
The common error on a horizontal leg tank is matching fittings and gaskets to the tank instead of to the chemical. Notice that the gasket material changes by chemical: Viton on the acids and hypochlorite, Aflas on peracetic acid, EPDM on the salts and glycols. For a DEF hauler, the listing is clear, DEF 32.5% is compatible when plumbed in 316 stainless steel with EPDM, not in plain PVC. Running EPDM on sulfuric or hydrochloric acid, or a standard PVC fitting where 316SS is called out for DEF or peracetic acid, is how a tank that is technically compatible still fails at the connection. Match the fitting and gasket to your specific chemical and concentration, not to the tank.
This tank ships LTL freight from the Enduraplas plant in Neche, ND, quoted live to your ZIP code. Get an exact number with our Freight Cost Estimator, or call 866-418-1777 to talk through frame, fittings and freight for your application. For application context, read Applicator and Leg Tanks for Fertilizer, Portable Utility Tanks and DOT Classification, and Fertilizer-Blend Tank Stratification.
