The Enduraplas 4500 Gallon White Horizontal Leg Tank (SKU THF04500W) is the rolling backbone of a large applicator or nurse-tank rig. Molded in natural white polyethylene with a 95 by 179 inch footprint and an 84-inch height, this horizontal leg tank carries 4,500 gallons across its full saddle length, and its integrated legs let it ride a trailer or chassis without a separate cradle. The natural white wall lets you read the liquid level at a glance, and the 1.9 specific-gravity rating is what makes this tank a true workhorse for heavy fertilizer blends and dense chemicals rather than just water.
Will it work for your load?
Match the contents to the rated weights before you fill it. Brimmed with plain water, the 4,500-gallon volume weighs 37,530 lb; the tank itself is rated to carry up to 71,307 lb of contents, which means you can run a full 1.9 SG product to the brim and stay inside the tank's rating. With this tank the constraint is almost always the trailer, not the tank, so size the frame, axles, and tires to the loaded weight you actually plan to haul. Confirm the dimensions against your chassis as well: at 179 inches long, 95 inches wide, and 84 inches tall, this is a wide, long, heavy unit, so check your overall haul width, deck height, and clearance before ordering. Review the technical drawing on this page, and use the Tank Sizing Calculator and Tank Sizing Guide to confirm the size and partial-fill weights against your tow vehicle. Confirm the exact fitting and outlet configuration with us before you order so the plumbing matches your spreader or transfer setup.
Chemical compatibility
This tank is molded in polyethylene at a 1.9 specific-gravity rating, which is what allows it to hold dense chemicals at the weights above. The tank resin is recorded as HDLPE? — confirm HDLPE versus XLPE with us before putting it into chemical service, because the resin determines which products it can safely hold; XLPE generally tolerates more aggressive and heated chemicals, so the answer can change your selection. Compatibility below is per the OEM chemical-resistance chart and is concentration- and temperature-specific; verify your exact product, strength, and operating temperature before committing.
Compatible chemicals (with the recommended fitting and gasket materials) include 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 (<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). See the full chemical compatibility charts to match concentration, temperature, fitting, and gasket material to your service.
The mistake to avoid
The costliest error on a 1.9 SG leg tank is matching the fitting and gasket to the tank instead of to the chemical. The polyethylene wall handles a wide range of products, but the threaded fitting and gasket are the failure point — sodium hypochlorite, the strong acids, and hydrogen peroxide call for Viton and the right plumbing material, while DEF and peracetic acid need 316 stainless. Putting EPDM where Viton belongs, or carbon-steel hardware on an aggressive acid, is how a haul tank leaks on the road. Equally costly: filling a 1.9 SG product to the brim and then discovering the trailer is rated below the 71,307 lb contents ceiling. If you are blending fertilizer in this tank, read our guides on fertilizer-blend tank stratification and applicator and leg tanks for fertilizer before your first load.
This tank ships LTL freight, quoted live to your ZIP, from the Enduraplas plant in Neche, ND. Get a real number for your delivery address with the Freight Cost Estimator, or call 866-418-1777 to lock in the right fittings, gaskets, and freight for your application before you order.
