The Norwesco 325 Gallon Black Horizontal Leg Tank is a self-supporting horizontal poly tank built for mobile and stationary ag work, sized at 68 inches long, 38 inches wide, and 43 inches tall on a 38.0 x 68.0-inch footprint. Molded from black polyethylene with a 1.5 specific-gravity rating, this is a true horizontal leg tank: the molded-in legs let it sit stable on a skid, trailer, or pickup bed without a separate cradle. The black resin holds up to UV exposure in the field, which is why farmers searching for a Norwesco horizontal leg tank for fertilizer hauling and water transport keep coming back to this size.
Will it work for your job?
At 325 gallons of rated capacity, plan your loads by weight, not just volume. Full of water this tank carries roughly 2,710 lb, and at its 1.5 specific-gravity ceiling it is rated to hold up to 4,066 lb of contents. That weight number is the one that matters when you spec a trailer, skid, or truck bed: a partially filled tank surging on the road behaves very differently than a stationary one, so match the rated contents weight to your axle and frame capacity before the first haul. If you are unsure whether 325 gallons is the right size for your acreage or fill schedule, run the numbers through our Tank Sizing Calculator and review the Tank Sizing Guide. The technical drawing on this page shows the tank geometry and fitting locations; this listing does not specify port and outlet sizes, so confirm the outlet and fill-opening dimensions from the drawing or by phone before you order a fitting and gasket package.
Chemical compatibility
This tank is molded from polyethylene and carries a 1.5 specific-gravity rating, and that rating governs which chemicals it can safely hold. The following are compatible at the listed concentrations when paired with the correct fittings and gaskets, per the OEM chemical-resistance chart, which is concentration- and temperature-specific:
- Acetic Acid (60%) - PP/PVC fittings, EPDM gaskets
- Aluminum Sulfate (50%) - PVC fittings, EPDM gaskets
- Calcium Chloride (40%) - PVC fittings, EPDM gaskets
- DEF (diesel exhaust fluid) (32.5%) - 316SS stainless fittings, EPDM gaskets
- Ferrous Sulfate (20%) - PVC fittings, EPDM gaskets
- Magnesium Chloride (30%) - PVC fittings, EPDM gaskets
- Sodium Carbonate (30%) - PVC fittings, EPDM gaskets
- Urea Solution (50%) - PP/PVC fittings, EPDM gaskets
- Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets
One callout for fleet and ag buyers: DEF (32.5%) is the one chemical in this group that needs 316 stainless fittings rather than PVC or PP, with EPDM gaskets. Defaulting to PVC on a DEF build is a common and avoidable mistake.
A second common mistake is assuming this 1.5-rated tank covers every chemical. It does not. Heavier or more aggressive chemistries need a higher 1.9 specific-gravity tank, and several of them also need non-EPDM gaskets or upgraded fittings: Hydrochloric Acid (PVC, Viton), Hydrofluoric Acid (PP/PVC, Viton), Hydrofluosilicic Acid (PP/PVC, Viton), Hydrogen Peroxide (PVC, Viton), Phosphoric Acid (PVC, Viton), Sodium Hypochlorite (PVC, Viton), Sulfuric Acid (CPVC, Viton), and Peracetic Acid (316SS, Aflas). Others on the 1.9-SG list run with EPDM: Ethylene Glycol, Ferric Chloride, Ferric Sulfate, Polyaluminum Chloride, Potassium Carbonate, Potassium Hydroxide, Propylene Glycol (PP/316SS), Sodium Bisulfate, Sodium Bisulfite, Sodium Thiosulfate, and Zinc Orthophosphate (PP/316SS). If your application is on either list, talk to us before ordering so we point you at the right SG tank and the matching gasket and fitting package. Always confirm against the OEM chart at your actual concentration and temperature, and review the full chemical compatibility reference.
Hauling and DOT considerations
Because this is a leg-style tank often used as a portable applicator or nurse tank, the way you mount and transport it matters as much as the tank itself. Our guide on Norwesco applicator and leg tanks for fertilizer walks through DOT non-roadable trailer scope, and the breakdown of 49 CFR 173.5 agricultural exemptions covers farm-fleet classification. If you are blending fertilizer in this tank, read up on tank stratification and mixing protocol so you do not run a stratified load off-spec.
This tank ships LTL freight from the nearest Norwesco plant to your ZIP, with stocking locations in Fairfield, TX; Griffin, GA; Hanford, CA; Owego, NY; Shawnee, OK; Sheldon, IA; St. Bonifacius, MN; Tooele, UT; Washington Court House, OH; and Washougal, WA. That ten-plant network means most ZIPs ship from a nearby point, which keeps LTL cost and transit time down. Get a live, ZIP-specific rate with our Freight Cost Estimator, or call us at 866-418-1777 and we will confirm the closest shipping point, lead time, and the right fitting and gasket package for your contents before you order.
