The Snyder Industries 500 Gallon Plastic Horizontal Leg Tank (SKU SII-1400100N45) is a self-supporting white polyethylene tank built for hauling and transferring liquids on a trailer, skid, or applicator frame. It measures 72 inches long, 49 inches wide, and 55 inches tall, riding on a 49.0 x 72.0 inch footprint that sits flat on its molded legs without a separate stand. Snyder rates this body for contents up to a 1.9 specific gravity, which is what lets it carry dense fertilizer blends and chemical concentrates rather than just water. If you are searching for a 500 gallon horizontal leg tank, this is the body that does that job.
Will it work for your load?
Capacity is a true 500 gallons. Filled with plain water (1.0 SG) the contents weigh about 4,170 pounds; loaded to the full 1.9 SG rating the tank carries up to roughly 7,923 pounds of product. Use both numbers to size your trailer, axles, and tie-downs before you buy, because a horizontal leg tank lives or dies by how that loaded weight transfers to the frame underneath it. To make the ceiling tangible: a 500-gallon load of 98% sulfuric acid (near 1.84 SG) sits right at this tank's weight limit, so confirm your axle rating before committing to a dense product. The 1.9 SG rating is the maximum offered on this body; there is no heavier-duty step-up version, so if your product runs above 1.9 SG this tank is not the right choice. Run your own numbers through the Tank Sizing Calculator or the Tank Sizing Guide if you are unsure the 500-gallon size fits your fleet.
One thing to verify: the fitting and outlet configuration is not specified in this listing. Confirm your outlet size, port locations, and lid against the technical drawing on this page, or call 866-418-1777 before you plumb the tank. Do not assume a standard port layout.
Chemical compatibility
This is a polyethylene tank molded in white and rated to a 1.9 specific gravity, which puts a wide range of agricultural and water-treatment chemicals within reach at the concentrations listed below. The tank resin is listed as high-density linear polyethylene; confirm HDLPE versus XLPE for your chemical before you put it into service, since crosslinked resin handles some oxidizers differently. Match every chemical to the correct fitting and gasket material and check the OEM chemical-resistance chart for your exact concentration and temperature first.
Note the three outliers before anything else: DEF and Peracetic Acid both require 316 stainless steel fittings, not plastic, and peracetic acid is the only service in this set that calls for Aflas gaskets. Those are the choices buyers get wrong.
| Chemical | Max conc. | 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 | — | 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 | <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 |
| Ozonated Water | up to 10 PPM | PVC | EPDM |
Every pairing is concentration- and temperature-specific; verify your exact service against the OEM chemical-resistance chart and our chemical compatibility reference before ordering valves and gaskets.
The mistake to avoid
The most common error on a horizontal leg tank like this is plumbing it before checking the gasket and fitting metal. Chlorine-family and strong-oxidizer chemicals here (sodium hypochlorite, hydrogen peroxide, phosphoric acid, sulfuric acid) call for Viton gaskets, while most salts and glycols use EPDM, and peracetic acid needs Aflas. An EPDM gasket on a Viton service line will weep and fail. Just as costly: DEF and peracetic acid need 316 stainless fittings, not the PVC most buyers reach for by default. The second mistake is loading a dense product without confirming the 1.9 SG ceiling against your real product weight, then overloading the trailer. Match the fitting metal, the gasket elastomer, and the SG to your actual chemical.
This tank ships LTL freight from Snyder's plant in Chowchilla, CA, quoted live to your ZIP code. Get an exact freight number with our Freight Cost Estimator, or call 866-418-1777 and we will quote it for you. For application context on leg and applicator tanks, see our guides on applicator and leg tanks for fertilizer, DOT classification for farm-fleet portable tanks, fertilizer-blend tank stratification, and Snyder Captor double-wall tanks for SPCC compliance.
