The Norwesco 1325 Gallon Black Heavy Duty Horizontal Leg Tank is a transport-and-haul tank built for moving water and ag liquids in the field. Molded in black polyethylene with a 1.9 specific gravity rating, this heavy-duty platform is rated to carry dense agricultural liquids and concentrated chemicals at weights that exceed what a standard 1.5-SG tank can hold. It measures 70 in. tall, 66 in. wide, and 99 in. long, with a 66.0 x 99.0 in. footprint that seats squarely on a sled, skid, or flatbed for field transport. If you have searched for a Norwesco horizontal leg tank in black, this is the heavy-duty haul version of that platform.
Will it work for your load?
Capacity is 1325 gallons. Filled with water, the contents alone weigh about 11,050 lb, and the tank is rated to a maximum contents weight of 20,996 lb thanks to the 1.9 SG wall thickness. That headroom is the whole point of the heavy-duty version: water tops out around 8.34 lb/gal, but fertilizer blends, brines, and acid concentrates run heavier, and the 1.9 rating gives you margin to haul them. The 1.9 SG wall is the heaviest-duty step Norwesco offers on this platform - there is no higher-rated version to move up to. Always size the actual liquid against that 20,996 lb ceiling before you fill, and check axle and trailer ratings to match. Our Tank Sizing Calculator and Tank Sizing Guide walk through weight-by-density math so you do not overload the chassis. The molded leg design keeps the load low and stable in transit, which is why these are a fixture on applicator and nurse-trailer rigs.
Chemical compatibility
This is a polyethylene tank rated to 1.9 specific gravity. The resin code is not confirmed in our records, so before any chemical service, confirm whether your unit is HDLPE or XLPE with us at 866-418-1777 - the two resins resist different chemistries. With the 1.9-SG wall, this platform is compatible with a wide range of heavy and concentrated liquids when you spec the correct fitting and gasket materials, which matter as much as the resin. The decisive split is gasket and hardware material:
- Viton gaskets required: sulfuric acid (98%, CPVC fittings), hydrochloric acid (37%), hydrofluoric acid (48%), phosphoric acid (85%), sodium hypochlorite (<16.5%), and hydrogen peroxide (50%).
- 316SS hardware required: DEF (32.5%, EPDM gasket) and peracetic acid (30%, Aflas gasket); propylene glycol and zinc orthophosphate run PP/316SS with EPDM.
- EPDM gaskets (PVC/PP fittings): acetic acid (60%), aluminum sulfate (50%), calcium chloride (40%), magnesium chloride (30%), ferric chloride (50%), ferric sulfate (60%), ferrous sulfate (20%), hydrofluosilicic acid (26%), ethylene glycol (100%), potassium hydroxide (saturated), potassium carbonate (50%), sodium carbonate (30%), sodium thiosulfate (40%), and urea solution (50%).
A few entries in our data have no concentration listed - polyaluminum chloride, sodium bisulfate, and sodium bisulfite (plus propylene glycol and zinc orthophosphate noted above) - so confirm your working concentration at 866-418-1777 before speccing. Ozonated water (up to 10 PPM) is also compatible but is the one item with no dedicated reference page; call to confirm. Every rating is concentration- and temperature-specific, so check our full chemical compatibility reference for your exact service conditions before ordering fittings.
The mistake to avoid
The trap on a haul tank is treating the 1.9 SG rating as a blank check. The rating sets how heavy a liquid the wall can hold - not whether the chemistry is safe long-term, and not whether your trailer can carry it. Three checks before you fill: confirm the resin (HDLPE vs XLPE) for chemical duty, confirm your liquid's total weight stays under the 20,996 lb maximum rated contents, and confirm fittings - this tank's fitting configuration is not pre-set in our records, so verify bulkhead and outlet sizes and locations at 866-418-1777 before ordering, and do not assume a standard outlet ships with it. For non-roadable trailer and DOT classification questions on ag haul rigs, our guides on Norwesco applicator and leg tanks and portable utility tank exemptions cover the rules, and our fertilizer-blend stratification guide explains how to keep a dense blend from salting out in transit. See the technical drawing on this page for fitting locations and exact dimensions.
This tank ships LTL freight from the Norwesco plant in Washington Court House, OH, quoted live to your ZIP. Get a rate with our Freight Cost Estimator, or call 866-418-1777 to confirm specs, fittings, and delivery. Listed before freight - freight is quoted separately to your delivery ZIP.
