The Enduraplas 4500 Gallon Yellow Horizontal Leg Tank (SKU THF04500Y) is a 4,500-gallon horizontal leg tank built for heavy haul and bulk transport, rated to a 1.9 specific gravity so it carries dense agricultural and industrial liquids that would overstress a 1.5-rated tank. The cradle-style legs spread the load for transport on a frame or trailer, and the yellow polyethylene body measures 179 inches long, 95 inches wide, and 84 inches tall, sitting on a 95.0 x 179.0 footprint. The 1.9 SG rating is the spec that separates it from lighter leg and horizontal tanks people cross-shop, and it makes this a workable choice for DEF transport, fertilizer haul, and dense chemical movement.
Will it work for your load?
Sizing is everything on a tank this big. Filled with water, the contents weigh 37,530 lb; the tank is rated to a maximum contents weight of 71,307 lb at its full 1.9 specific gravity. That difference - 33,777 lb of additional dead load between a water fill and a full 1.9-SG fill - is the number that sizes your axles and tie-downs, not the water figure. Spec your transport frame to carry the rated weight, not the water weight. Run your liquid's weight through the Tank Sizing Calculator and review the Tank Sizing Guide before you commit to a frame design. One honest caveat: fitting count and outlet sizes are not published in our spec data for this SKU - confirm the port layout with us or from the technical drawing on this page before you build your plumbing.
Chemical compatibility
This tank is molded from polyethylene and rated to a 1.9 specific gravity, which is why it suits dense and aggressive liquids. The resin code in our source data is unconfirmed, so confirm the exact resin construction (HDLPE versus XLPE) with us before any chemical service - resin type matters for warranty and longevity. Always verify against the OEM chemical-resistance chart for your specific concentration and operating temperature; the entries below are concentration-specific and assume the matched fitting and gasket materials. Three gasket families cover this list - EPDM for most salts and glycols, Viton for oxidizers and strong acids, and Aflas specifically for peracetic acid. Four chemicals require stainless rather than plastic fittings: DEF, peracetic acid, propylene glycol, and zinc orthophosphate all call for 316SS.
Compatible chemicals from the chart include acetic acid (60%, PP/PVC fittings, EPDM gaskets), aluminum sulfate (50%, PVC, EPDM), calcium chloride (40%, PVC, EPDM), DEF (32.5%, 316SS fittings, 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 fittings, Viton gaskets), 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 fittings, Viton), urea solution (50%, PP/PVC, EPDM), zinc orthophosphate (PP/316SS, EPDM), and ozonated water (up to 10 PPM, PVC, EPDM). Match the fitting and gasket material to the chemical exactly - the wrong gasket is the most common and most avoidable mistake on a chemical tank. Start with our full chemical compatibility reference, and note that sodium hypochlorite (chlorine bleach) is the one to watch: the chart caps it under 16.5% on Viton.
Sizing, transport, and field setup
Buyers searching for an Enduraplas horizontal leg tank, a yellow horizontal tank, or a large horizontal transport tank land on this model, often for DEF or fertilizer haul. If you are hauling fertilizer or running a mixed blend, read our guide on applicator and leg tanks for fertilizer and the DOT classification rules for farm-fleet portable tanks to confirm how your setup is regulated on the road. For blend stability, our deep dive on fertilizer-blend tank stratification covers the mixing protocol that keeps a blend from salting out before the spreader runs.
This tank ships LTL freight from the Enduraplas plant in Neche, ND - the nearest named shipping point for this SKU - and freight is quoted live to your ZIP. Get an exact number with our Freight Cost Estimator, or call 866-418-1777 and we will quote the haul before you order.
