The Enduraplas 550 Gallon Black Horizontal Leg Tank (SKU THF00500B) is a polyethylene horizontal leg tank built for hauling and transporting liquid in the field. The black resin blocks light to slow algae growth and UV breakdown, and the molded support legs let the tank ride flat on a trailer, skid, or pickup bed. It holds 550 gallons, measures 80 inches long by 57 inches wide by 40 inches high, and is the tank buyers reach for when they search for an Enduraplas horizontal leg tank in black.
Will it work for your job?
This tank carries a specific gravity rating of 1.9, which is what makes it a true haul tank rather than a water-only vessel: it is built to carry liquids heavier than water. Full of water (SG 1.0) the contents weigh about 4,587 pounds; loaded to its 1.9 rating the contents can reach roughly 8,715 pounds. That is about 4,128 pounds more than water in the same 550 gallons, so do not size axles or tie-downs off the water number. Plan your trailer, axle capacity, and tie-downs around the loaded weight. The footprint is 57.0 x 80.0 inches, so confirm your trailer deck or truck bed can carry that span before you order. To match a tank to your load and route, the Tank Sizing Calculator and Tank Sizing Guide walk through capacity and weight. Outlet, fill, and vent sizes are not published in our data for this tank, so confirm fitting locations and sizes against the technical drawing on this page before you plumb anything.
Chemical compatibility
This is a polyethylene tank (resin listed as HDLPE) with a 1.9 specific gravity rating. The resin code carries a question mark, so before any chemical service confirm with us whether this specific tank is HDLPE or XLPE (cross-linked) - that distinction changes what it can safely hold. With the right plumbing, an SG 1.9 tank can handle a wide range of liquids, but you must match fittings and gaskets to the chemical. Acetic Acid (60%) runs PP/PVC fittings with EPDM gaskets; Aluminum Sulfate (50%), Calcium Chloride (40%), Ferric Chloride (50%), Ferric Sulfate (60%), Ferrous Sulfate (20%), Magnesium Chloride (30%), Potassium Carbonate (50%), Potassium Hydroxide (saturated), Sodium Carbonate (30%), Sodium Thiosulfate (40%), and Ethylene Glycol (100%) all use PVC with EPDM. DEF (32.5%) and Peracetic Acid (30%) call for 316SS fittings - DEF with EPDM, Peracetic Acid with Aflas. Hydrochloric Acid (37%), Phosphoric Acid (85%), Hydrogen Peroxide (50%), and Sodium Hypochlorite (under 16.5%) use PVC with Viton; Hydrofluoric Acid (48%) and Hydrofluosilicic Acid (26%) use PP/PVC with Viton; Sulfuric Acid (98%) needs CPVC with Viton. Urea Solution (50%) runs PP/PVC with EPDM. Polyaluminum Chloride, Sodium Bisulfate, Sodium Bisulfite, Propylene Glycol, and Zinc Orthophosphate each have their own fitting and gasket pairing, and Ozonated Water (up to 10 PPM) runs PVC with EPDM though it has no dedicated reference page yet. Verify every selection against the manufacturer's chemical-resistance chart, which is concentration- and temperature-specific, before filling. Start with our chemical compatibility guide and the per-chemical pages, for example sulfuric acid, sodium hypochlorite, DEF, and hydrochloric acid.
The mistake to avoid
The most common error on a haul tank like this is loading a heavy liquid without first confirming the resin. A 1.9 SG rating tells you the wall thickness can carry the weight, but it does not by itself certify the resin for a given chemical - and this tank's resin is listed with a question mark. Do not assume cross-linked construction; confirm HDLPE versus XLPE with us first, then match fittings and gaskets to your exact chemical and concentration. For farm-fleet haulers, the same care applies to road use: our guides on applicator and leg tanks for fertilizer and DOT non-roadable-trailer scope, portable utility tanks and the 49 CFR 173.5 agricultural exemption, and fertilizer-blend tank stratification cover the classification and mixing details that catch buyers off guard.
This tank ships LTL freight from Neche, ND, with cost quoted live to your ZIP code. Get a number with the Freight Cost Estimator or call us at 866-418-1777 and we will confirm fittings, resin, and the best freight option for your load.
