Chem-Tainer 120 Gallon PE Rectangular Open Top Tank

The Chem-Tainer 120 Gallon PE Rectangular Open Top Tank is a polyethylene container built for batch storage, mixing, and transfer work where you dip, scoop, or pour from the top rather than gravity-drain through a cone. The open-top rectangular footprint sits flat and packs tightly against a wall or alongside other tanks, which is why it turns up so often for operations searching for an open top tank or a rectangular tank that uses floor space efficiently.

Will it work for your job?

This is a 120-gallon rectangular open top tank molded from polyethylene by Chem-Tainer. Filled to capacity with water it carries roughly 1,001 lb (120 gal x 8.34 lb/gal at specific gravity 1.0), so the pad, platform, or floor beneath it has to support that load without flexing. That figure is water-specific; a heavier-than-water solution changes both the load math and the material requirements, so if you are storing something denser than water, call 866-418-1777 before assuming this open-top tank fits the duty. Because the top is open, this tank is built for atmospheric, vented service, not pressurized or fully sealed applications. Use the Tank Sizing Calculator and the Tank Sizing Guide to confirm 120 gallons matches your batch volume and refill cadence before you commit.

Fittings, dimensions, and the on-page drawing

Our data does not specify a factory drain outlet for this unit, which is consistent with a top-access, vented design. Check the technical drawing on this page to confirm whether your tank ships with an outlet or whether you will need a field-installed bulkhead fitting for your plumbing. The exterior length, width, and height also live on that drawing rather than in this listing, and on a rectangular open-top the footprint is the whole point. Confirm the L x W x H against your available floor space or containment curb before you order.

The mistake to avoid

The most common misstep with an open top tank is treating it like a sealed reservoir. The open top means evaporation, airborne debris, and freeze exposure are all in play, so plan a cover and a freeze-protection strategy if the tank lives outdoors in a cold climate. If you are setting this on an outdoor pad, the concrete pad sizing guide walks through carrying that ~1,001 lb full load correctly, and if the tank feeds a reuse or aggregation setup, the industrial water reuse tank topology guide covers how open-top storage fits into a banded train.

Ready to move on this 120-gallon rectangular open top tank? This tank ships LTL freight from Chem-Tainer's plant in West Babylon, New York, with the rate quoted live to your ZIP code. Pull a real number for your address with the Freight Cost Estimator, or call 866-418-1777 and we will work the quote with you and confirm sizing, pad requirements, and the West Babylon ship point so the tank arrives ready to put to work.