The Enduraplas 550 Gallon Green Horizontal Leg Tank (SKU THF00500G) is a 550-gallon polyethylene haul tank built to ride low on a trailer, skid, or flatbed and stay put on the move. The horizontal leg-tank body measures 80 in long by 57 in wide by 40 in tall and sits on integrated legs that give it a flat 57.0 x 80.0 in footprint, so it needs no custom cradle. Full of plain water it carries roughly 4,587 lb; because it carries a 1.9 specific-gravity rating, it is engineered to haul dense agricultural and chemical loads up to 8,715 lb of rated contents. Before you fill it, run the load against your trailer's axle and tongue ratings with our Tank Sizing Calculator and the Tank Sizing Guide.
Will this tank work for your haul?
This is a green horizontal tank, so it blocks light and limits algae growth in the stored liquid, and the low center of gravity from the horizontal leg-tank shape is exactly why buyers search for an Enduraplas horizontal leg tank in this 550 class. The number that matters most is the 1.9 SG rating. Water and light fluids sit well inside that envelope, and the tank is rated to carry contents far heavier than water, which is what makes it a fit for fertilizer and dense chemical hauling rather than freshwater transport alone. DEF (diesel exhaust fluid) at 32.5% is a common haul application here, though it calls for 316SS fittings rather than the PVC used for most loads. Reference the technical drawing on this page for leg spacing, lid position, and any molded port locations before you spec your plumbing. Note that this listing does not include factory fitting specifications in our data, so confirm the fitting layout and port sizes by phone at 866-418-1777 before you order.
Chemical compatibility
This tank carries a 1.9 specific-gravity rating. Its polyethylene resin grade is not fully confirmed in our data, so confirm HDLPE versus XLPE (cross-linked) construction with the manufacturer before committing the tank to chemical service. Always verify the OEM chemical-resistance chart for your exact chemical, since ratings are concentration- and temperature-specific. Not every chemical here uses PVC fittings and EPDM gaskets: Sulfuric Acid needs CPVC, DEF and Peracetic Acid need 316SS, Peracetic Acid needs Aflas, and the strong acids and hypochlorite need Viton. Within the 1.9 SG envelope, this tank is listed compatible with the following at the noted concentrations and recommended fitting and gasket materials:
- 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 materials above to your chemical, and see the full chemical compatibility reference for concentration and temperature limits.
The mistake to avoid
The costly error on a haul tank like this is treating the 1.9 SG rating as a license to fill with any liquid at any temperature. A 1.9-SG load nearly doubles the weight over the same 57 x 80 footprint - from about 4,587 lb of water to 8,715 lb of rated contents - so check your axle and tongue ratings against the loaded weight, not just the tank rating. The rating also does not mean every chemical is compatible with the polyethylene wall or your fittings; pick the wrong gasket for an aggressive acid and the connection fails long before the tank does. The second trap is the resin question: HDLPE and XLPE behave differently in chemical service, so confirm which one you are buying before you store anything but water or fertilizer. One thing you will not have to second-guess is the wall rating - this tank already carries the highest 1.9 SG rating, so there is no heavier-duty version to step up to for denser loads. For trailer-mounted ag use, our guides on applicator and leg tanks for fertilizer and fertilizer-blend tank stratification cover loading, mixing, and DOT classification in depth.
This tank ships LTL from the Enduraplas plant in Neche, ND, with freight quoted live to your ZIP. Get a freight quote in seconds with our Freight Cost Estimator, or call 866-418-1777 to spec fittings and confirm the resin for your chemical before you order.
