The Enduraplas 400 Gallon Yellow Horizontal Sump Bottom Leg Tank (SKU THD00400Y) is a 400-gallon polyethylene horizontal leg tank built for field transport and applicator service. It measures 74 inches long by 46 inches wide by 42 inches tall, rides on integrated legs, and carries a 1.9 specific gravity rating, the highest-rated polyethylene class we offer, so it hauls dense liquids that would over-stress a standard 1.5 SG tank. The sump bottom drains to a low point so you can pull product out cleanly instead of leaving it stranded on a flat floor.
Will it work for your job?
Sizing is where horizontal leg tanks catch people off guard, so run the numbers before you build the trailer or skid. Filled with water this tank weighs about 3,336 pounds, and at its full 1.9 SG rating it is built to carry contents up to 6,338 pounds. That delta matters: if you are hauling a heavy fertilizer blend or a dense acid, the frame, axle, and tie-downs under the tank have to be rated for the contents weight, not the water weight. The footprint is 46.0 x 74.0 inches, so confirm your trailer deck or sprayer frame fully supports the saddle of the tank across that span. For mixed loads and run calculations, our Tank Sizing Calculator and Tank Sizing Guide walk through capacity, weight, and the math that keeps a horizontal tank from overloading a single-axle trailer. See the technical drawing on this page for the sump outlet and fitting locations before you plumb it, and call 866-418-1777 to confirm outlet size and fitting options for your build.
Chemical compatibility
This is a polyethylene tank with a 1.9 specific gravity rating. The resin family is listed as HDLPE, but confirm HDLPE versus XLPE for this exact build before putting it into chemical service, since cross-linked and linear polyethylene resist different chemistries. The 1.9 SG rating means this tank can hold the dense solutions below at their listed concentrations where many lighter tanks cannot, and 1.9 SG is the top tier we offer, so there is no heavier-rated polyethylene tank to size up to. Always size to the heaviest product you plan to run.
Per the OEM chemical-resistance chart, which is concentration- and temperature-specific, this tank is compatible with the following at the noted concentrations, using the noted fitting and gasket materials:
- 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 (metal required), 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 (metal required), 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 (metal required), EPDM gaskets
- Ozonated Water (up to 10 PPM, reference only) — PVC fittings, EPDM gaskets
Match the gasket to the chemical, not just the fitting: the oxidizers and strong acids above call for Viton or Aflas rather than EPDM. Watch the metal-fitting entries too, DEF, Peracetic Acid, and Zinc Orthophosphate want 316SS rather than a PVC bulkhead, so do not default to a plastic fitting kit on those. Verify your exact product, concentration, and operating temperature against the manufacturer's chemical-resistance chart and our chemical compatibility reference before committing.
The mistake to avoid
The most common error on a horizontal leg tank like this is sizing the trailer and tie-downs to the water weight and then running a heavier blend. At 1.9 SG this tank legitimately carries up to 6,338 pounds of contents, nearly double its 3,336-pound water weight, and that load goes straight into your frame and axles. Build the support structure and brakes to the contents weight, and if you are running a fertilizer blend, watch for stratification on long hauls. Our guides on applicator and leg tanks for fertilizer, portable utility tanks and the 49 CFR 173.5 ag exemption, and fertilizer-blend tank stratification cover the DOT classification and mixing protocol that keep a field tank legal and on-spec.
This Enduraplas 400 gallon horizontal leg tank ships LTL freight from the Enduraplas plant in Neche, ND, quoted live to your ZIP. Get your exact rate with our Freight Cost Estimator, or call 866-418-1777 and we will price the freight and confirm sump outlet and fitting options for your application.
