The Enduraplas 550 Gallon Yellow Horizontal Leg Tank (SKU THF00500Y) is built to haul liquid into the field. It carries 550 gallons in a low-slung horizontal leg-tank body, with a 57-by-80-inch footprint and a 40-inch height, so it drops onto a trailer, skid, or pickup bed and rides low for stability on the move. The yellow polyethylene shell carries a 1.9 specific gravity rating, which is the number that decides whether this enduraplas horizontal leg tank can safely hold what you intend to put in it.
Will it work for your job
Match your load to the numbers, not the gallon count. Filled with water, the contents weigh about 4,587 lb. The 1.9 SG rating means this tank is engineered to carry contents up to roughly 8,715 lb at full volume (about 15.85 lb per gallon), so it has real headroom for liquids heavier than water. Note that 1.9 is the top SG rating offered in this horizontal leg-tank body, so there is no heavier-rated alternate to step up to for this configuration. Confirm your trailer, hitch, and tow vehicle are rated for that loaded weight before you fill it. The horizontal leg design keeps the center of gravity low across the 57-by-80-inch footprint, which is what you want when a partially full tank sloshes on rough ground. To convert your liquid's weight and volume into a tank size, the Tank Sizing Calculator and Tank Sizing Guide walk you through it.
Chemical compatibility
This is a yellow polyethylene tank rated to 1.9 specific gravity. The resin grade is recorded in our data as HDLPE but is not yet confirmed, so for any long-term chemical storage, confirm HDLPE (high-density linear) versus XLPE (cross-linked) before you commit, since that distinction changes what the wall can safely hold over time. Call 866-418-1777 and we'll verify it for your service. Compatibility is concentration- and temperature-specific, so check your exact chemical, concentration, and operating temperature against the OEM chemical-resistance chart before ordering.
A common use for a 550-gallon leg tank is mobile DEF, and within the 1.9 SG envelope this body handles DEF at 32.5% with 316SS fittings and EPDM gaskets. DEF specifically requires stainless wetted hardware, so brass or galvanized fittings are the wrong call here. Beyond DEF, this tank pairs with the following at the listed concentrations and fitting/gasket materials: Acetic Acid (60%, PP/PVC, EPDM), Aluminum Sulfate (50%, PVC, EPDM), Calcium Chloride (40%, PVC, EPDM), Ethylene Glycol (100%, PVC, EPDM), Ferric Chloride (50%, PVC, EPDM), Ferric Sulfate (60%, PVC, EPDM), Ferrous Sulfate (20%, PVC, EPDM), Hydrochloric Acid (37%, PVC, Viton), Hydrofluoric Acid (48%, PP/PVC, Viton), Hydrofluosilicic Acid (26%, PP/PVC, Viton), Hydrogen Peroxide (50%, PVC, Viton), Magnesium Chloride (30%, PVC, EPDM), Peracetic Acid (30%, 316SS, Aflas), Phosphoric Acid (85%, PVC, Viton), Polyaluminum Chloride (PVC, EPDM), Potassium Carbonate (50%, PVC, EPDM), Potassium Hydroxide (saturated, PVC, EPDM), Propylene Glycol (PP/316SS, EPDM), Sodium Bisulfate (PVC/PP, EPDM), Sodium Bisulfite (PVC/PP, EPDM), Sodium Carbonate (30%, PVC, EPDM), Sodium Hypochlorite (under 16.5%, PVC, Viton), Sodium Thiosulfate (40%, PVC, EPDM), Sulfuric Acid (98%, CPVC, Viton), Urea Solution (50%, PP/PVC, EPDM), Zinc Orthophosphate (PP/316SS, EPDM), and Ozonated Water (up to 10 PPM, PVC, EPDM). See the full chemical compatibility resource for the detail behind each pairing.
The mistake to avoid
The most common error on a tank like this is treating the 1.9 SG rating and the gallon count as the only checks. They aren't. The default pairing is PVC fittings with EPDM gaskets, but several services break that default and a mismatch leaks: Sulfuric Acid 98% needs CPVC fittings, not plain PVC; Peracetic Acid needs 316SS fittings with Aflas gaskets, not Viton or EPDM; and DEF, Propylene Glycol, and Zinc Orthophosphate use 316SS or PP wetted hardware. Match the fitting and gasket material to your specific chemical and concentration above, confirm the resin (HDLPE versus XLPE), and verify compatibility at your actual operating temperature.
Freight
This tank ships LTL freight from the Enduraplas plant in Neche, ND, quoted live to your ZIP based on the loaded shipping dimensions. Get an exact number with the Freight Cost Estimator, or call 866-418-1777 to confirm specs and arrange delivery. Fitting size and outlet locations are not specified in our data for this SKU, so confirm your outlet configuration by phone or check the technical drawing on this page before ordering. If you are spec'ing this for fertilizer or DOT non-roadable trailer use, our guides on applicator and leg tanks for fertilizer, portable utility tanks and DOT classification, and fertilizer-blend tank stratification are worth reading first.
