The Enduraplas 550 Gallon White Horizontal Leg Tank (SKU THF00500W) is a 550-gallon polyethylene transport tank built for moving water and ag chemicals across the field or down the road. It measures 80 inches long, 57 inches wide, and 40 inches tall, with integrally molded legs that keep the load low and stable on a trailer or skid. The natural white wall lets you read the liquid level at a glance, and the 1.9 specific gravity rating is the headline number on this tank: it is engineered to haul dense liquids, not just water. If you have been searching for an Enduraplas horizontal leg tank in the 550 range, this is the configuration sized for hauling.
Will it work for your liquid and your trailer?
Start with weight, because that is what determines your trailer, your tie-downs, and your tow vehicle. Filled with water, this tank carries roughly 4,587 pounds of contents. At its full 1.9 specific gravity rating, the maximum rated contents weight climbs to 8,715 pounds, so a dense fertilizer blend or a heavy acid loads this tank far past a simple water weight. That 8,715 lb figure is the hard ceiling: 1.9 specific gravity is the densest liquid this wall is rated to carry, so if your product runs heavier than 1.9 SG, stop and call before you fill it rather than overloading the tank. Plan your axle rating and your hauling setup around the actual product weight, not the gallon count. The footprint is 57 by 80 inches, which sets the deck space you need on a trailer or pickup bed. Run your numbers through the Tank Sizing Calculator and the Tank Sizing Guide before you commit, and confirm the contents weight against your equipment. Outlet and fitting sizes are not published in this listing, so confirm them from the technical drawing or by phone before you order valves or cam-locks.
Chemical compatibility
This is a polyethylene tank carried at a 1.9 specific gravity rating, which is what makes it a true chemical-haul tank rather than a water-only tote. Confirm the exact resin (HDLPE versus XLPE) for your specific chemical service against the OEM chart before you fill it, since resin construction changes what the tank will hold. Specific gravity, concentration, and temperature all drive real-world compatibility, so always check the manufacturer's chemical-resistance chart for the exact concentration and temperature of your product. The chemicals below are listed with the concentration and the fitting and gasket materials that pair with each:
- 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
Pay particular attention to the oxidizers and strong acids in that list. Sodium Hypochlorite (<16.5%) and Hydrogen Peroxide (50%) both require Viton gaskets, not EPDM, and Sulfuric Acid (98%) requires Viton gaskets paired with CPVC fittings rather than standard PVC. Match your fitting and gasket materials to the chemical you are running - the wrong gasket is the most common and most preventable mistake on a chemical-haul tank. For the full picture across every product, see our chemical compatibility resource, and always cross-check against the OEM chemical-resistance chart for your exact concentration and temperature.
Built for the haul
This is a horizontal leg tank, which is the right shape when the tank has to ride low and tow well. The molded legs cradle the body so the center of gravity stays down, and the horizontal profile keeps liquid surge under control on the move. For how leg tanks and horizontal portable utility tanks fit into ag and DOT use, our guides on applicator and leg tanks for fertilizer and loaf-style portable utility tanks and the 49 CFR 173.5 ag exemption walk through classification. If you are blending fertilizer, the guide on tank stratification and mixing protocol is worth reading before your first batch. Reference the technical drawing on this page for fitting locations and exact dimensions.
This tank ships LTL freight from the plant in Neche, ND, and freight is quoted live to your ZIP code. Get your number with the Freight Cost Estimator, or call 866-418-1777 and we will sort out the haul with you.
