The Norwesco 525 Gallon Black Horizontal Leg Tank (SKU 40605) is a 525-gallon polyethylene horizontal leg tank built for transport-style hauling on a skid, trailer, or pickup. It measures 71 inches long by 49 inches wide by 54 inches tall, riding on integrated support legs that cradle the rounded body so contents stay low and stable while you move them. The black exterior blocks UV and light penetration, and the tank carries a 1.5 specific gravity rating, meaning it is engineered to safely hold liquids up to 1.5 times the density of water. That rating is the single most important number on this page, so read the chemical compatibility section before you fill it.
Will it work for your load?
This is a horizontal leg tank, the workhorse shape for moving water, fertilizer, and field chemicals where the tank has to sit on a vehicle and not roll. The footprint is 49.0 x 71.0 inches, so confirm your trailer deck or truck bed clears those dimensions plus room for the legs to seat flat. Filled with water, the contents alone weigh about 4,378 pounds, and at the full 1.5 specific gravity rating the contents can reach roughly 6,568 pounds. A 525-gallon load at 1.5 SG concentrates that 6,568 pounds over a 49 x 71 inch footprint, so verify your trailer's GVWR and axle rating cover dense liquids, not just the 4,378-pound water figure. The biggest mistake on a leg tank is under-rating the rig for a dense liquid, then discovering the trailer was built for water weight only. If you want help matching gallons to load weight, run the Tank Sizing Calculator or read the Tank Sizing Guide.
Fittings and lid
Fitting and lid sizes are not specified in our catalog data for this tank, so confirm the outlet, fitting, and lid sizes against the OEM technical drawing on this page and at the time of order. Call 866-418-1777 and we will verify the outlet and lid size match your plumbing before you buy. For the technical layout of the legs, fittings, and lid, see the technical drawing on this page.
Chemical compatibility
This tank is molded from polyethylene with a 1.5 specific gravity rating. The exact resin grade has not been confirmed, so confirm the resin type (HDLPE versus XLPE cross-linked) with us before putting any chemical into service, since the two resins resist different reagents. Always size your liquid to the 1.5 SG rating: a chemical with a density above 1.5 needs a higher-SG tank, not this one. Compatibility below follows the OEM chemical-resistance chart, which is concentration- and temperature-specific.
Within the 1.5 SG rating, this tank is suited to Acetic Acid (60%, PP/PVC fittings, EPDM gaskets), Aluminum Sulfate (50%, PVC, EPDM), Calcium Chloride (40%, PVC, EPDM), DEF (32.5%, 316SS fittings, EPDM), Ferrous Sulfate (20%, PVC, EPDM), Magnesium Chloride (30%, PVC, EPDM), Sodium Carbonate (30%, PVC, EPDM), Urea Solution (50%, PP/PVC, EPDM), and Ozonated Water (up to 10 PPM, PVC, EPDM; reference chart only). Match the fitting and gasket material listed for each chemical, then verify against the OEM chart for your exact concentration and operating temperature. See the full chemical compatibility reference for details.
Chemicals that need a higher-SG tank
Several common chemicals are heavier than this 1.5-rated tank can carry and require a 1.9 specific gravity tank instead. If your service involves Ethylene Glycol, Ferric Chloride, Ferric Sulfate, Hydrochloric Acid, Hydrofluoric Acid, Hydrofluosilicic Acid, Hydrogen Peroxide, Peracetic Acid, Phosphoric Acid, Polyaluminum Chloride, Potassium Carbonate, Potassium Hydroxide, Propylene Glycol, Sodium Bisulfate, Sodium Bisulfite, Sodium Hypochlorite, Sodium Thiosulfate, Sulfuric Acid, or Zinc Orthophosphate, you need the 1.9 SG tank, not this one. Note the seal escalation: most of those chemicals stay on PVC fittings with EPDM gaskets, but the aggressive acids and oxidizers (Hydrochloric, Hydrofluoric, Hydrofluosilicic, Phosphoric, Sulfuric, Hydrogen Peroxide, and Sodium Hypochlorite) require Viton gaskets rather than standard EPDM, and Peracetic Acid requires Aflas seals with 316SS fittings. Call 866-418-1777 and we will point you to the correct 1.9 SG tank and the right seal material rather than risk failure on this one. Specifying the right SG and gasket up front is cheaper than replacing a stressed tank later.
This 525-gallon Norwesco horizontal leg tank ships LTL freight, quoted live to your ZIP from the nearest of our nine Norwesco plants in Fairfield, TX; Griffin, GA; Hanford, CA; Owego, NY; Shawnee, OK; St. Bonifacius, MN; Tooele, UT; Washington Court House, OH; and Washougal, WA. Get a quote with the Freight Cost Estimator, or call 866-418-1777 and we will confirm the closest plant, your load weight, and the right fittings for your chemical. For application background, see our guides on Norwesco applicator and leg tanks for fertilizer, portable utility tanks and DOT classification, and fertilizer-blend tank stratification.
