The Enduraplas 4000 Gallon Black Cone Bottom Tank with Stand (SKU THC04000KB) is a full-drain chemical storage and batching tank built for operations that need every gallon to empty cleanly through the bottom. It carries a 1.9 specific gravity rating, an empty weight of 1,100 lb, a 3" polypropylene female NPT bulkhead outlet at the cone apex, and a 16" threaded vented manway up top. The black polyethylene wall blocks UV and suppresses algae, and the tank ships with its supporting stand so the cone can discharge into a pump, tote, or transfer line.
Will it work for your application?
Standing 146" tall on a 110"-diameter footprint, this 4000 gallon cone bottom tank holds 4,000 gallons and is FDA-approved polyethylene. The 1.9 SG rating is the number that matters most here: it tells you the heaviest liquid the wall is engineered to hold, and at 1.9 this is the heaviest-duty tier offered — there is no higher-rated tank to step up to. Filled with water it carries 33,360 lb of contents; at its maximum rated 1.9 specific gravity it is built to hold up to 63,384 lb. Match your fluid's specific gravity against that 1.9 ceiling before you buy — a denser liquid than the rating allows is the fastest way to overstress a cone tank. One caveat for chemical duty: the resin grade (HDLPE vs XLPE) still carries a "?" in our data and requires confirmation before you commit this tank to a chemical, so call before ordering. Run your volume and weight through the Tank Sizing Calculator and the Tank Sizing Guide to confirm the stand, cone angle, and drain height suit your process. The 3" PP bulkhead outlet and 16" vented manway are the standard connection points; the vented lid matters on any cone-bottom install so the tank can breathe as it drains.
Chemical compatibility
This is an HDLPE-class polyethylene tank rated to 1.9 specific gravity. The resin grade in our data still carries a "?" — confirm HDLPE versus XLPE with us before chemical service, because the resin determines which chemicals it can safely hold. Compatibility below is drawn from the Snyder Industries OEM chemical-resistance chart and is concentration- and temperature-specific; verify your exact chemical, concentration, temperature, and both fitting and gasket material before ordering. Because 1.9 is the top SG tier, every chemical on the chart is covered here, including the concentrated oxidizers and strong acids that demand a full 1.9 tank.
Chemicals this tank's 1.9 SG rating supports (with the OEM-recommended fitting and gasket) include Ethylene Glycol (100%, PVC / EPDM), Ferric Chloride (50%, PVC / EPDM), Ferric Sulfate (60%, PVC / EPDM), Hydrochloric Acid (37%, PVC / Viton), Hydrofluoric Acid (48%, PP or PVC / Viton), Hydrofluosilicic Acid (26%, PP or PVC / Viton), Hydrogen Peroxide (50%, PVC / Viton), 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 or 316SS / EPDM), Sodium Bisulfate (PVC or PP / EPDM), Sodium Bisulfite (PVC or PP / EPDM), Sodium Hypochlorite (under 16.5%, PVC / Viton), Sodium Thiosulfate (40%, PVC / EPDM), Sulfuric Acid (98%, CPVC / Viton), Zinc Orthophosphate (PP or 316SS / EPDM), and Ozonated Water (up to 10 PPM, PVC / EPDM — confirm this one with us, as it isn't yet page-backed). Lower-SG-rated fluids such as Acetic Acid (60%, SG 1.5), Aluminum Sulfate (50%, SG 1.5), Calcium Chloride (40%, SG 1.5), DEF (32.5%, SG 1.35, 316SS / EPDM), Ferrous Sulfate (20%, SG 1.5), Magnesium Chloride (30%, SG 1.5), Sodium Carbonate (30%, SG 1.5), and Urea Solution (50%, SG 1.35) all fall comfortably under this tank's 1.9 rating.
Two cross-checks before you order. First, match the outlet material to the chart: the tank's stock 3" bulkhead is polypropylene, but several chemicals above require a different fitting — CPVC for sulfuric acid, 316SS for DEF, peracetic acid, propylene glycol, and zinc orthophosphate, and PVC for most of the rest — so swap the outlet to the specified material before service. Second, for gaskets the chart splits cleanly: oxidizers and strong acids (hydrochloric, hydrogen peroxide, sodium hypochlorite, phosphoric, sulfuric, hydrofluoric) take Viton, salts and caustics take EPDM, and peracetic acid is the lone Aflas exception. Grabbing an EPDM gasket for sodium hypochlorite is the mistake that turns a compatible chemical into a leak. Full details are in our Chemical Compatibility Database.
Freight and next steps
This tank ships LTL freight from the Enduraplas plant in Neche, ND, quoted live to your ZIP — never bundled into the list price. Because it arrives on its stand at 146" tall, confirm your dock or forklift access before delivery, and see the technical drawing on this page for exact dimensions. Get a freight number with the Freight Cost Estimator, and if you're weighing a poly stand against a steel frame, our stand selection decision tree and stand compatibility matrix walk through the trade-offs. Questions on resin confirmation, fittings, or freight? Call 866-418-1777 and we'll spec it with you before you order.
