The Enduraplas 300 Gallon Black Horizontal Sump Bottom Leg Tank (SKU THD00300B) is a black polyethylene haul tank built for moving liquid down the road and across the field. It measures 74 inches long, 46 inches wide, and 34 inches tall, sitting on a 46.0 x 74.0 inch footprint, with a sump bottom that lets contents drain low. Molded from polyethylene and rated to a 1.9 specific gravity, this 300 gallon horizontal leg tank is built to carry dense liquids, not just water. If you have searched for an Enduraplas horizontal tank, a 300 gallon leg tank, or a 300 gallon horizontal leg tank for transport duty, this is the size and shape that fits.
Will it hold what you need to haul?
Filled with water, this 300 gallon tank carries about 2,502 pounds of contents. Because it is rated to a 1.9 specific gravity, it is approved for liquids far heavier than water, up to a maximum rated contents weight of about 4,754 pounds. That works out to roughly 15.8 pounds per gallon, so at 1.9 SG you can fill all 300 gallons without exceeding the 4,754 pound rating. The headroom is the whole point of a leg tank like this: many agricultural and industrial fluids weigh well more per gallon than water, and a tank rated only to 1.0 or 1.5 would be over its limit before it is full. Size your trailer or truck-bed capacity to the 4,754 pound figure, and check your fluid's actual weight per gallon against that rating. The Tank Sizing Calculator and the Tank Sizing Guide will help you match the tank to your load. Molded fitting sizes and locations are not specified in our data, so confirm the outlet, sump, and lid configuration with us before you plumb it, and see the technical drawing on this page for reference.
Chemical compatibility
This tank is molded from polyethylene with a 1.9 specific gravity rating, which is what makes it suitable for many concentrated chemicals. The resin grade reads as HDLPE but is unconfirmed, so confirm HDLPE versus XLPE with us before putting this tank into chemical service. Compatibility always depends on concentration, temperature, and the fitting and gasket materials you choose, so check each chemical against the OEM chemical-resistance chart for your specific concentration and operating temperature. Within this tank's 1.9 SG rating, the following are listed as compatible: acetic acid (60%, PP/PVC fittings, EPDM gaskets), aluminum sulfate (50%, PVC, EPDM), calcium chloride (40%, PVC, EPDM), DEF (32.5%, 316SS, 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 (listed compatible at concentrations 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). Match your fitting and gasket materials to the chemical you are running, and review our full chemical compatibility resource before ordering.
The mistake to avoid
The most common error with a horizontal haul tank is sizing freight or fittings to water weight. Sodium hypochlorite is listed compatible only at concentrations under 16.5% with PVC fittings and Viton gaskets, sulfuric acid at 98% needs CPVC fittings with Viton gaskets rather than the PVC that works for most salts, and high-purity products like DEF and peracetic acid call for 316 stainless. Pick the wrong gasket or fitting material and you risk a leak in transit. And before any chemical use, settle the HDLPE versus XLPE resin question with our team, because that distinction changes what this tank can safely carry over the long run.
This tank ships LTL freight from the Enduraplas plant in Neche, ND, with the rate quoted live to your ZIP code. Get your number with the Freight Cost Estimator or call 866-418-1777 to lock in your shipment. For application background on hauling dense ag fluids, see our guides on fertilizer-blend tank stratification and on DOT classification for farm leg tanks.
