The Chem-Tainer 300 Gallon Heavy Duty Horizontal Leg Tank (SKU TC3866LA) is a 300-gallon horizontal leg tank molded in Natural White polyethylene, sized at 73 inches long, 37 inches wide, and 42 inches tall on a 37.0 x 73.0 footprint. The integrally molded legs hold the tank stable on a trailer or skid, which is why this style shows up under searches for a horizontal tank, a leg tank, and a 300 gallon tank. What sets this unit apart from a standard water leg tank is its 1.9 specific gravity rating, the number that decides whether it can safely haul the dense chemical you have in mind.
Will it work for your job
Plan around the weight and the footprint, not just the gallons. This tank sits on a 73 x 37 inch base, carries roughly 2,502 lb filled with water, and at its full 1.9 specific gravity rating is built to hold contents up to about 4,754 lb. Use those three figures together to size your trailer deck, axles, and tie-downs before you buy, and run your exact volume through the Tank Sizing Calculator or the Tank Sizing Guide if you are deciding between this and another size. The 1.9 rating is the headroom that lets this tank carry heavier-than-water solutions a lower-rated water tank cannot.
Chemical compatibility
This tank is polyethylene with a 1.9 specific gravity rating. The resin is recorded as HDLPE but flagged for confirmation, so verify HDLPE versus XLPE with us before putting it into chemical service, since cross-linked and linear polyethylene resist chemicals differently. Always check the OEM chemical-resistance chart for your specific concentration and temperature before committing, and match your fittings and gaskets to the chemical, not just the tank.
The following are within range for this resin and specific gravity rating, with the recommended fitting and gasket materials: Acetic Acid (60%, PP/PVC fittings, EPDM gaskets), 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 (PVC, EPDM), Potassium Carbonate (50%, PVC, EPDM), Potassium Hydroxide (saturated, PVC, EPDM), Propylene Glycol (PP/316SS, EPDM), Sodium Bisulfate (PVC/PP, EPDM), Sodium Bisulfite (PVC/PP, EPDM), Sodium Carbonate (30%, PVC, EPDM), Sodium Hypochlorite (under 16.5%, PVC, Viton), Sodium Thiosulfate (40%, PVC, EPDM), Sulfuric Acid (98%, CPVC, Viton), Urea Solution (50%, PP/PVC, EPDM), Zinc Orthophosphate (PP/316SS, EPDM), and Ozonated Water (up to 10 PPM, PVC, EPDM). Each linked page and the full chemical compatibility tool give concentration- and temperature-specific guidance.
The mistake to avoid
The common error on a leg tank like this is matching the gasket and fitting to the tank instead of to the chemical. Several of these solutions force a jump away from standard PVC: DEF (32.5%) and peracetic acid both require 316 stainless steel fittings rather than plastic, peracetic acid needs Aflas gaskets, and sulfuric acid at 98% requires CPVC fittings. Sodium hypochlorite, hydrochloric acid, phosphoric acid, and sulfuric acid all call for Viton gaskets rather than EPDM. Pulling the wrong elastomer or undersizing the fitting material is the fastest way to a weeping connection on the road, so settle the fitting and gasket spec for your exact chemical before you order.
This tank ships LTL freight from Merced, CA, quoted live to your ZIP. Get a freight estimate with the Freight Cost Estimator, or call 866-418-1777 and we will help you confirm the resin, fittings, and freight for your haul. For DOT and trailer questions on portable utility and leg tanks, see our guides on applicator and leg tanks for fertilizer and loaf-style portable utility tanks and the agricultural exemption.
