The Enduraplas 500 Gallon Yellow Horizontal Sump Bottom Leg Tank ships as a horizontal leg tank on an integrated frame, measuring 80 inches long, 57 inches wide, and 49 inches tall with a 57.0 x 80.0 inch footprint. It is molded from polyethylene in yellow and carries a 1.9 specific gravity rating - the top heavy-duty rating offered, engineered for the densest agricultural and water-treatment fluids. The sump bottom drains toward the outlet so you can pull the tank down to near-empty without leaving product stranded, which is exactly why this Enduraplas horizontal tank shows up under searches for a 500 gallon horizontal leg tank for batch chemical and fertilizer work.
Will this tank work for my application?
The 1.9 SG rating means the wall and frame are engineered for liquids up to 1.9 times the density of water. Full of plain water at 500 gallons, the contents alone weigh about 4,170 lb; loaded to the tank's maximum rated density, the contents can reach 7,923 lb. Plan your pad, frame support, and any trailer or skid around the upper figure if you intend to run dense fluids, not the water number. Two features set this apart from a standard horizontal: the sump bottom drains to the outlet for near-complete draw-down between batches - useful when you change products and cannot afford a heel of the last chemical - and the integrated leg frame gives you a flat, self-supporting base with a low center of gravity that needs only a level pad, not a custom cradle. Confirm the fitting and vent layout against the technical drawing on this page before you commit to a plumbing plan, and use the Tank Sizing Calculator and Tank Sizing Guide to verify 500 gallons matches your draw-down and refill cycle.
Chemical compatibility
This tank is polyethylene rated at 1.9 specific gravity. Confirm the exact resin with us before aggressive chemical service. The chemicals below are compatible with a 1.9 SG polyethylene tank at the listed concentrations, each with the fitting body and gasket material that hold up against them. These wetted-hardware parts are selected per chemical and are NOT included with the bare tank - confirm the fitting and gasket spec for your specific chemical and concentration before ordering. Always cross-check against the OEM chemical-resistance chart for your exact concentration and operating temperature, since both shift the outcome. Because 1.9 SG is the top rating offered, it covers essentially every fluid below - even the densest common ones like sulfuric acid 98%, ferric chloride 50%, and calcium chloride 40% sit under that ceiling - so you never need to step up to a higher-rated tank.
- 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, 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, 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 under 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, EPDM gaskets
- Ozonated Water up to 10 PPM - PVC fittings, EPDM gaskets
Note how the wetted hardware escalates with the chemical: EPDM gaskets cover the salts, glycols, and mild acids; Viton is required for the concentrated oxidizers and strong acids - hydrochloric 37%, hydrogen peroxide 50%, phosphoric 85%, sulfuric 98%, and sodium hypochlorite under 16.5%; Aflas is reserved for peracetic acid; and DEF and peracetic acid step up to 316 stainless wetted bodies. For full detail on any of these, see each chemical's page above and the master chemical compatibility reference.
The mistake to avoid
The most common error on a tank like this is loading a dense chemical without honoring the 1.9 SG rating and the gasket material it calls for. The maximum rated contents weight is 7,923 lb - that is the structural ceiling, and exceeding the density rating stresses the wall and frame regardless of liquid level. Just as important, match the seal to the chemical across the three tiers in the data: EPDM for salts, glycols, and mild acids; Viton for the concentrated oxidizers and acids like hydrogen peroxide, phosphoric, sulfuric, and sodium hypochlorite; and Aflas only for peracetic acid, which along with DEF also calls for 316 stainless wetted bodies. Drop an EPDM gasket into sulfuric or peroxide service and it fails where Viton holds. And settle the exact resin question with us before you fill it with anything aggressive.
This tank ships LTL freight from the plant in Neche, North Dakota, quoted live to your ZIP code - get an exact number with the Freight Cost Estimator or call 866-418-1777. For sizing and application help, our team can walk you through it by phone, and the applicator and leg tanks for fertilizer guide and fertilizer-blend stratification guide cover field practices for getting consistent product out of a horizontal leg tank.
