The Enduraplas 300 Gallon White Horizontal Sump Bottom Leg Tank (SKU THD00300W) is a low-slung horizontal leg tank built for moving and storing liquid where a tall vertical footprint won't work. Molded in natural white polyethylene, it carries a 1.9 specific gravity rating, so it is engineered to hold dense agricultural and industrial liquids that would over-stress a 1.0 or 1.5 tank. The integrated legs and sump bottom let the tank sit stable on a trailer or skid and drain toward the low point, which is why operators searching for a 300 gallon horizontal leg tank land here for transport and applicator duty.
Will it work for your job?
Confirm three things before you buy: capacity, footprint, and contents weight. The tank holds 300 gallons and measures 34 in high by 46 in wide by 74 in long, giving a 46.0 x 74.0 in footprint - plan your trailer deck or containment pad around that span before ordering. Weight is where horizontal leg tanks catch people off guard. Filled with water, this tank carries roughly 2,502 lb. At its full 1.9 specific gravity rating it can carry up to 4,754 lb of contents, so your trailer, hitch, and tie-downs must be rated for the loaded weight of the actual liquid - not the water number. If you are unsure how a given liquid's density changes the math, run it through our Tank Sizing Calculator or read the Tank Sizing Guide. The 1.9 rating is the highest density rating we stock, so for the densest liquids you will not find or need a heavier-rated tank above this one.
Chemical compatibility
This is a polyethylene tank rated to 1.9 specific gravity. The resin is recorded as HDLPE with a question mark in our data, so before any chemical service confirm with us whether your unit is HDLPE or XLPE (cross-linked) - the two resins behave differently against aggressive chemicals, and the wrong choice fails early. A quick gasket rule from the compatibility data: EPDM is the default for the salts, glycols, and bases below; Viton handles the strong acids and oxidizers (hydrochloric, phosphoric, sulfuric, hydrogen peroxide, hydrofluoric, sodium hypochlorite); and Aflas is specific to peracetic acid. Watch the three that will not run on standard PVC hardware - DEF (316SS), Peracetic Acid (316SS), and Sulfuric Acid 98% (CPVC) - so you do not default-order the wrong fittings. Compatible chemicals below are concentration- and temperature-specific; always match your exact concentration and service temperature to the OEM chemical-resistance chart, and verify fitting and gasket materials separately:
- Acetic Acid (60%) - PP/PVC fittings, EPDM gaskets - details
- Aluminum Sulfate (50%) - PVC fittings, EPDM gaskets - details
- Calcium Chloride (40%) - PVC fittings, EPDM gaskets - details
- DEF (32.5%) - 316SS fittings, EPDM gaskets - details
- Ethylene Glycol (100%) - PVC fittings, EPDM gaskets - details
- Ferric Chloride (50%) - PVC fittings, EPDM gaskets - details
- Ferric Sulfate (60%) - PVC fittings, EPDM gaskets - details
- Ferrous Sulfate (20%) - PVC fittings, EPDM gaskets - details
- Hydrochloric Acid (37%) - PVC fittings, Viton gaskets - details
- Hydrofluoric Acid (48%) - PP/PVC fittings, Viton gaskets - details
- Hydrofluosilicic Acid (26%) - PP/PVC fittings, Viton gaskets - details
- Hydrogen Peroxide (50%) - PVC fittings, Viton gaskets - details
- Magnesium Chloride (30%) - PVC fittings, EPDM gaskets - details
- Peracetic Acid (30%) - 316SS fittings, Aflas gaskets - details
- Phosphoric Acid (85%) - PVC fittings, Viton gaskets - details
- Polyaluminum Chloride - PVC fittings, EPDM gaskets - details
- Potassium Carbonate (50%) - PVC fittings, EPDM gaskets - details
- Potassium Hydroxide (Saturated) - PVC fittings, EPDM gaskets - details
- Propylene Glycol - PP/316SS fittings, EPDM gaskets - details
- Sodium Bisulfate - PVC/PP fittings, EPDM gaskets - details
- Sodium Bisulfite - PVC/PP fittings, EPDM gaskets - details
- Sodium Carbonate (30%) - PVC fittings, EPDM gaskets - details
- Sodium Hypochlorite (<16.5%) - PVC fittings, Viton gaskets - details
- Sodium Thiosulfate (40%) - PVC fittings, EPDM gaskets - details
- Sulfuric Acid (98%) - CPVC fittings, Viton gaskets - details
- Urea Solution (50%) - PP/PVC fittings, EPDM gaskets - details
- Zinc Orthophosphate - PP/316SS fittings, EPDM gaskets - details
- Ozonated Water (up to 10 PPM) - PVC fittings, EPDM gaskets - call 866-418-1777 for ozonated-water guidance
For the full picture across more chemicals, see our Chemical Compatibility reference.
The mistake to avoid
The costliest error on a high-SG horizontal leg tank is matching the tank to volume but not to weight and resin. A buyer sees 300 gallons, assumes the water weight of about 2,502 lb, and sizes a trailer for it - then fills with a 1.9 SG liquid that loads the tank toward 4,754 lb and overruns the rig. Size the trailer to the liquid you will actually carry, and confirm your resin (HDLPE vs XLPE) and fitting/gasket materials against the chemical you intend to run. Background on transport classification for fertilizer and applicator setups is in our guides on applicator and leg tanks for fertilizer, portable utility tank DOT classification, and fertilizer-blend tank stratification.
This tank ships LTL freight from the single Enduraplas plant in Neche, ND, quoted live to your ZIP. Because it ships from one northern-plains origin and a loaded unit can reach 4,754 lb, use the loaded-liquid weight when you quote - distant ZIPs especially should price early with the Freight Cost Estimator, or call 866-418-1777 and we will quote the tank and freight together.
