The Norwesco 725 Gallon HDPE Horizontal Leg Tank in Black (SKU N-42412) is a black polyethylene horizontal leg tank built for hauling and transferring liquid on a frame, trailer, or skid. Integrally molded legs sit the tank flat so it can be mounted and strapped down for transport, and the black resin carries carbon-black pigment for UV protection in outdoor and field service. With a 1.9 specific gravity rating, this Norwesco HDPE horizontal leg tank is built for heavier-than-water liquids - the dividing line that separates real chemical and fertilizer duty from plain water storage.
Will it work for your job
This is a 725 gallon horizontal tank measuring 101 inches long by 49 inches wide by 54 inches high, with a 49.0 x 101.0 inch footprint. Empty it stays manageable, but loaded it commits real weight to your frame: filled with water it carries about 6,046 lb of contents, and at its full 1.9 specific gravity rating it can hold up to 11,488 lb of liquid. That gap matters - a dense fertilizer or brine reaches the tank's 11,488 lb structural ceiling at roughly 63% of a full water load, so it maxes the frame well before the tank looks full. Plan your trailer, frame, and tie-downs around the loaded figure that matches your fluid, not the water number. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm the loaded weight your application will actually impose, and review the Norwesco applicator and leg tank guide for fertilizer for how these tanks fit DOT and non-roadable-trailer use. Fitting and outlet sizes are not published in our spec record for this SKU - refer to the technical drawing on this page for fitting locations, or call to confirm the molded port layout before you build your plumbing.
Chemical compatibility
This tank is molded in polyethylene (the resin grade is unconfirmed in our records) and rated to 1.9 specific gravity. Because the resin code is unconfirmed, confirm HDLPE versus XLPE with us before committing the tank to chemical service - cross-linked and high-density linear polyethylene do not share the same chemical-resistance profile. The compatibility below comes from the OEM chemical-resistance chart and is concentration- and temperature-specific; always verify your exact concentration and service temperature against that chart before ordering. The 1.9 rating covers the dense liquids common to this tank's service, including the following at the listed concentrations:
- Acetic Acid (60%) - PP/PVC fittings, EPDM gaskets
- Aluminum Sulfate (50%) - PVC fittings, EPDM gaskets
- Calcium Chloride (40%) - PVC fittings, EPDM gaskets
- DEF (32.5%) - 316SS fittings, EPDM gaskets
- Ethylene Glycol (100%) - PVC fittings, EPDM gaskets
- Ferric Chloride (50%) - PVC fittings, EPDM gaskets
- Ferric Sulfate (60%) - PVC fittings, EPDM gaskets
- Ferrous Sulfate (20%) - PVC fittings, EPDM gaskets
- Hydrochloric Acid (37%) - PVC fittings, Viton gaskets
- Hydrofluoric Acid (48%) - PP/PVC fittings, Viton gaskets
- Hydrofluosilicic Acid (26%) - PP/PVC fittings, Viton gaskets
- Hydrogen Peroxide (50%) - PVC fittings, Viton gaskets
- Magnesium Chloride (30%) - PVC fittings, EPDM gaskets
- Peracetic Acid (30%) - 316SS fittings, Aflas gaskets
- Phosphoric Acid (85%) - PVC fittings, Viton gaskets
- Polyaluminum Chloride - PVC fittings, EPDM gaskets
- Potassium Carbonate (50%) - PVC fittings, EPDM gaskets
- Potassium Hydroxide (saturated) - PVC fittings, EPDM gaskets
- Propylene Glycol - PP/316SS fittings, EPDM gaskets
- Sodium Bisulfate - PVC/PP fittings, EPDM gaskets
- Sodium Bisulfite - PVC/PP fittings, EPDM gaskets
- Sodium Carbonate (30%) - PVC fittings, EPDM gaskets
- Sodium Hypochlorite (<16.5%) - PVC fittings, Viton gaskets
- Sodium Thiosulfate (40%) - PVC fittings, EPDM gaskets
- Sulfuric Acid (98%) - CPVC fittings, Viton gaskets
- Urea Solution (50%) - PP/PVC fittings, EPDM gaskets
- Zinc Orthophosphate - PP/316SS fittings, EPDM gaskets
- Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets
Match the fitting and gasket material to your specific chemical - notice that sulfuric acid calls for CPVC, the strong oxidizers move from EPDM to Viton, and peracetic acid needs 316 stainless with Aflas. DEF (32.5%) is the one chemical here that rules out PVC and CPVC entirely - it requires 316 stainless fittings - so a tank previously run in acid service should not be repurposed for DEF without clean, dedicated stainless fittings. See the full chemical compatibility reference for the complete chart.
The mistake to avoid
The costliest error on a leg tank like this one is hauling a dense liquid in a frame and tie-down setup sized for water. At 1.9 specific gravity the contents can weigh nearly twice what the same volume of water weighs, so a fertilizer blend, a calcium chloride brine, or a strong acid loads your trailer to the tank's 11,488 lb rating well before it looks full. The second mistake is treating polyethylene as one material - confirm the resin (HDLPE vs XLPE) and pair the right fitting and gasket to your chemical before the first fill. If you are blending fertilizer, the fertilizer-blend stratification guide covers how density-driven layering can leave a spreader running off-spec, and the HDPE color and pigment chemistry guide explains why this black tank holds up to UV in the field.
This tank ships LTL freight, quoted live to your ZIP, from the nearest of five Norwesco stocking plants - Fairfield, TX; Griffin, GA; Shawnee, OK; St. Bonifacius, MN; and Tooele, UT - so most of the country has a short LTL lane to draw from. Get a live number with the Freight Cost Estimator, or call 866-418-1777 to confirm specs, resin grade, and fitting layout and lock in your shipment.
