Norwesco 300 Gallon Applicator Saddle Tank

The Norwesco 300 Gallon Applicator Saddle Tank (N-40135) is a specialty applicator tank built for mobile fertilizer and liquid-chemical work, where the saddle profile lets the tank ride low and stable on a frame or trailer.It holds 300 gallons in a white polyethylene body rated to a 1.5 specific gravity, measures 68" long by 38" wide by 41" high, and weighs 87 lbs empty.It carries a 1.25" outlet and an 8" lid, is FDA approved, and is rated for contents up to 120 F / 48 C.

Will it work for your load?

Specific gravity is the number that decides this tank, and it converts straight into axle weight.Full of plain water (SG 1.0) the 300 gallons weigh about 2,502 lbs; multiply that baseline by your fluid's SG to size your rig.A DEF or urea solution near 1.5 SG runs roughly 3,378 lbs, and at the tank's maximum rated 1.5 SG the contents reach up to about 3,753 lbs.That headroom is why this Norwesco applicator tank suits dense liquid fertilizers and brines rather than water alone.Its 38" x 68" footprint drops into a saddle cradle or applicator frame, so check that number against your rig before ordering, and run the Tank Sizing Calculator and Tank Sizing Guide to confirm loaded weight for your application.See the technical drawing on this page for outlet and lid placement.

Chemical compatibility

This is a polyethylene tank (resin listed as HDLPE?), so before any chemical service confirm HDLPE vs XLPE with us — for plain water or fertilizer haul use the resin question does not block the sale.The compatibility data below comes from the Snyder Industries OEM chemical resistance chart as a reference and is concentration- and temperature-specific; match your exact chemical, concentration, temperature, and fitting and gasket materials against that chart.Comfortably within the 1.5 SG rating are the lighter DEF and urea fluids — DEF (32.5%, required SG 1.35, 316SS fittings/EPDM) and urea solution (50%, required SG 1.35, PP/PVC/EPDM).Riding right at the 1.5 ceiling are acetic acid (60%), aluminum sulfate (50%), calcium chloride (40%), ferrous sulfate (20%), magnesium chloride (30%), sodium carbonate (30%), and ozonated water (up to 10 PPM) — most calling for PVC fittings with EPDM gaskets.

Fittings, gaskets, and the higher-SG cases

The tank ships with a 1.25" outlet and 8" lid; chemical-service fittings and gaskets are selected separately by material spec (no part numbers are assigned here — order to spec).The pairings vary by chemical: EPDM gaskets for the fertilizer and salt list, but 316SS fittings for DEF.Denser, more aggressive chemicals exceed this tank's 1.5 SG and need a higher-SG (1.9) Norwesco tank instead — that is the correct choice for sulfuric acid (98%, CPVC/Viton), hydrochloric acid (37%, PVC/Viton), ferric chloride (50%), sodium hypochlorite (<16.5%, PVC/Viton), phosphoric acid (85%, PVC/Viton), hydrogen peroxide (50%, PVC/Viton), peracetic acid (30%, 316SS/Aflas), and ethylene glycol.Verify every service against the OEM chart and our chemical compatibility reference before you fill.

The mistake to avoid

The costly error on an applicator saddle tank is loading a heavy fertilizer or acid without checking specific gravity.This tank stops at 1.5 SG — put a 1.5 SG chemical in it and you are outside the rating, risking wall stress and failure on the road.Confirm your chemical's SG, and confirm HDLPE vs XLPE resin, before you fill.For DOT and agricultural-exemption context, see our guides on Norwesco applicator and leg tanks for fertilizer and the 49 CFR 173.5 agricultural exemption.

This tank ships LTL freight from the nearest Norwesco plant — including Burnet and Fairfield, TX; Griffin, GA; Hanford, CA; Lancaster, OH; Owego, NY; Shawnee, OK; Sheldon, IA; St.Bonifacius, MN; Tooele, UT; and Washougal, WA — with freight quoted live to your ZIP.Get your number from the Freight Cost Estimator or call 866-418-1777.