The Enduraplas 400 Gallon Yellow Horizontal Leg Tank (SKU THF00400Y) is a 400-gallon polyethylene horizontal leg tank built to haul liquid in the field. It measures 74 inches long by 46 inches wide by 37 inches high, sits on a 46.0 x 74.0 footprint, and rides on a leg-style base sized for skid mounting or trailer transport. Rated to a 1.9 specific gravity, it is one of the heavier-duty options in this format - the same horizontal leg tank growers and applicators search for when they need a 400 gallon horizontal tank that can carry dense liquids without flexing.
Will it work for your liquid and load?
Capacity is the easy part; weight is what catches people out. Filled with water this tank carries about 3,336 lb, and at its full 1.9 specific gravity rating the contents can reach roughly 6,338 lb. Size your skid, trailer, and tie-down hardware to that 6,338 lb max-rated number, not the dry tank or the water figure. The 1.9 SG rating is the ceiling for this leg-tank format, which is why it handles dense fertilizer blends and concentrated chemistries that would over-stress a lighter 1.5 SG tank. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm the 400-gallon size matches your route and refill cadence.
Chemical compatibility
This tank is yellow polyethylene rated to 1.9 specific gravity. The resin is recorded as HDLPE with a question mark, so confirm whether your tank is HDLPE or XLPE before any chemical service - cross-link versus high-density linear resin changes what the wall tolerates over time. That confirmation matters most for the oxidizers and aggressive acids below: sodium hypochlorite, hydrogen peroxide, peracetic acid, and 98% sulfuric acid are the selections that hinge on getting the resin right. All compatibility data here comes from the OEM chemical-resistance chart, which is concentration- and temperature-specific; match your exact concentration and service temperature against that chart before committing. The 1.9 SG rating covers every chemistry listed at its stated concentration.
Fitting and gasket materials are not interchangeable across these chemicals - match the wetted hardware to the chemistry, not to the tank:
| Chemical (concentration) | Fitting | Gasket |
|---|---|---|
| Acetic acid (60%) | PP/PVC | EPDM |
| 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 (verify conc.) | PVC | EPDM |
| Potassium carbonate (50%) | PVC | EPDM |
| Potassium hydroxide (saturated) | PVC | EPDM |
| Propylene glycol (verify conc.) | PP/316SS | EPDM |
| Sodium bisulfate (verify conc.) | PVC/PP | EPDM |
| Sodium bisulfite (verify conc.) | PVC/PP | EPDM |
| Sodium carbonate (30%) | PVC | EPDM |
| Sodium hypochlorite (<16.5%) | PVC | Viton |
| Sodium thiosulfate (40%) | PVC | EPDM |
| Sulfuric acid (98%) | CPVC | Viton |
| Urea solution (50%) | PP/PVC | EPDM |
| Zinc orthophosphate (verify conc.) | PP/316SS | EPDM |
| Ozonated water (up to 10 PPM) | PVC | EPDM |
For chemistries shown as "verify conc.," the OEM chart does not specify a concentration - confirm yours against the chart before service. See the full chemical compatibility reference for the complete, concentration- and temperature-specific picture.
The mistake to avoid
The most common error on a high-SG leg tank like this is reusing standard PVC fittings and EPDM gaskets across every chemical. The hardware that works for calcium chloride is wrong for DEF (316SS), sulfuric acid (CPVC/Viton), or peracetic acid (316SS/Aflas). Spec the wetted fitting and gasket per the chart above, and confirm the resin (HDLPE vs XLPE) before any oxidizer or aggressive-acid service.
This tank ships LTL freight from the plant in Neche, ND, with the rate quoted live to your ZIP - get your number with the Freight Cost Estimator or call 866-418-1777. For application fit on applicator and leg tanks, see our guides on applicator and leg tanks for fertilizer, portable utility tanks and DOT classification, and fertilizer-blend tank stratification.
