The Norwesco 3725 Gallon HDPE Horizontal Leg Tank is a polyethylene horizontal leg tank built for hauling and transport, where the leg-supported, low-center-of-gravity profile keeps a full load stable on a trailer or skid. Norwesco molds this tank for portable duty, and the published 1.9 specific gravity rating tells you exactly how dense a liquid it is engineered to carry. That rating, not the gallon count alone, is the number that decides whether your product is a fit.
Will it work for your load
Filled with plain water, this 3,725-gallon tank carries 31,066 lb. At its 1.9 specific gravity rating it is rated for up to 59,026 lb of contents, which is the ceiling for the heaviest fertilizer blends and dense chemical solutions. Read those two numbers together: the 59,026 lb figure is the SG-derived contents ceiling, so you cannot pour 3,725 gallons of a 1.9-SG product into this tank and stay inside the rating. The rated fill volume for a dense product is lower than the full geometric 3,725 gallons. Size your trailer, axles, and suspension to the loaded weight before you spec the hitch, because a leg tank that out-weighs its trailer rating is the most common and most expensive mistake on a horizontal hauling tank. Run your fill height and product density through the Tank Sizing Calculator and the Tank Sizing Guide so the loaded weight lands inside your equipment's rating, not over it.
Fittings and the technical drawing
This tank has been redrawn with revised end sumps for cleaner drainage. Fitting sizes and bulkhead locations are read off the technical drawing on this page rather than listed in the spec text, so review the drawing for the sump and outlet layout and confirm those positions match your plumbing before you order. The end-sump revision changes the drain geometry, so if you are reusing plumbing from an older revision of this tank, re-verify sump and outlet positions against the current drawing. The tank ships as a bare tank: the bulkhead fittings and gaskets called out per chemical below are a separate spec and must be ordered to suit your service.
Chemical compatibility
This is an HDPE leg tank with a 1.9 specific gravity rating. The resin is recorded as HDLPE pending confirmation, so before any chemical service confirm HDLPE versus XLPE for your product. Compatibility is concentration- and temperature-specific, so match the OEM chemical-resistance chart to your exact solution and operating temperature, and pair the tank with the right fitting and gasket materials below. At the rated densities, this tank can handle 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). At 1.9 SG this is the heaviest-rated tier offered in this form factor, so none of the chemicals listed here require stepping up to a denser tank. Most chemicals have their own detail page, such as Sulfuric Acid, Hydrochloric Acid, DEF, and Sodium Hypochlorite; start from the chemical compatibility index and confirm your product, concentration, and temperature against the OEM chart. Watch the gasket column: oxidizers and strong acids call for Viton or Aflas rather than EPDM, sodium hypochlorite stays below 16.5%, and acids like Sulfuric (CPVC + Viton) or Peracetic (316SS + Aflas) need their specific fitting and gasket, not the default EPDM. Specifying EPDM where the chart calls for Viton is the kind of fitting mistake that fails a tank the wall itself could have handled.
Freight and how to order
This horizontal leg tank ships LTL on a freight truck, quoted live to your ZIP. It ships from the nearest Norwesco plant in our network, either Fairfield, TX or St. Bonifacius, MN, so a Texas or southern-Plains buyer typically draws from Fairfield and a northern buyer from St. Bonifacius. For a real number to your delivery ZIP, use the Freight Cost Estimator or call 866-418-1777. If you are spec'ing this tank into an applicator rig or a DOT non-roadable trailer build, our guide on Norwesco applicator and leg tanks for fertilizer and the writeup on fertilizer-blend tank stratification walk through density, mixing, and field verification before you load.
