The Norwesco 525 Gallon Black Heavy Duty Horizontal Leg Tank is a portable utility tank built for hauling and dispensing on the move. Molded in black polyethylene with a 1.9 specific gravity rating, this tank carries Norwesco's heavy-duty designation, and the wall is engineered to handle dense agricultural and industrial liquids, not just water. The horizontal leg design lets the tank sit flat and stable on a trailer or skid, and the integral legs cradle the contents low for a manageable center of gravity in transit. Listed at 525 gallons, it measures 71 inches long, 49 inches wide, and 54 inches tall, with a 49.0 x 71.0-inch footprint.
Will this tank do the job
The 1.9 SG rating is the number that matters most on a horizontal leg tank. Filled with plain water, a 525-gallon load weighs about 4,378 pounds; loaded to the tank's maximum rated contents, you are looking at roughly 8,319 pounds. Those two numbers define the wall's density ceiling: 8,319 divided by 4,378 lands at 1.9, so any liquid up to about 15.8 pounds per gallon is within the wall rating at full volume. Use that per-gallon check to confirm your product fits, then spec your trailer, axles, and tie-downs against the full 8,319-pound contents weight, not just the gallon count. Whether you are running a field sprayer rig, a nurse tank for a spreader, or a mobile dispensing setup, size the load against your towing equipment first. The Tank Sizing Calculator and Tank Sizing Guide walk through that math step by step. At 1.9 SG this is already the heavy-duty wall rating, with no denser-rated step up in this line, so spec it when your contents run past standard 1.5 SG service.
Chemical compatibility
This is a polyethylene tank with a 1.9 SG rating. Our resin record for this tank is not fully confirmed (listed as HDLPE pending verification), so confirm HDLPE versus crosslinked (XLPE) construction with us before committing to chemical service, since that distinction changes long-term resistance for some chemistries. Always match fittings and gaskets to the specific chemical and concentration, and verify against the manufacturer's chemical-resistance chart, which is concentration- and temperature-specific.
Based on the OEM compatibility data for this tank class, the following are workable when fittings and gaskets are correctly specified: 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 (under 16.5%, PVC, Viton), sodium thiosulfate (40%, PVC, EPDM), sulfuric acid (98%, CPVC, Viton), urea solution (50%, PP/PVC, EPDM), and zinc orthophosphate (PP/316SS, EPDM). Ozonated water (up to 10 PPM, PVC, EPDM) appears in the OEM reference data as well, but has no dedicated compatibility page on our site yet. The pattern to read off this list: EPDM is the default gasket for the salts, glycols, and alkalis, but switch to Viton for the oxidizers and strong acids (hydrochloric, hydrofluoric, hydrofluosilicic, hydrogen peroxide, phosphoric, sulfuric, and sodium hypochlorite), and Aflas specifically for peracetic acid. Move from PVC to 316 stainless fittings for DEF, peracetic acid, propylene glycol, and zinc orthophosphate. Confirm your selection on the linked chemical pages and the full chemical compatibility reference.
The mistake to avoid
The most common error on a heavy-duty leg tank is treating the SG rating as a suggestion. A 1.9 SG tank is rated for dense liquids, but the wrong gasket on an aggressive chemical defeats the build. Match the fitting and gasket material to your exact chemical and concentration, confirm HDLPE versus XLPE with us before chemical service, and never exceed the maximum rated contents weight in transit. One more note on this SKU: fitting and outlet locations are not confirmed in our data, so confirm size and placement with us before you order rather than assuming a layout. For fertilizer hauling specifically, our guides on applicator and leg tanks for fertilizer, DOT classification for farm fleet use, and fertilizer-blend stratification cover the regulatory and mixing details. See the technical drawing on this page for available dimensional detail.
This horizontal leg tank ships LTL freight, quoted live to your ZIP from the nearest of Norwesco's plants in Fairfield, TX; Hanford, CA; Shawnee, OK; St. Bonifacius, MN; Tooele, UT; Washington Court House, OH; and Washougal, WA. Get an exact freight number with the Freight Cost Estimator, or call 866-418-1777 and we will quote it for you. Listed before freight, this is the Norwesco black horizontal leg tank built for the haul.
