The Snyder Industries 4000 Gallon ASTM Black Heavy Duty Vertical Storage Tank (SKU 7421100N51) is a molded polyethylene vertical storage tank built for bulk water and heavy-duty liquid storage. It stands 104 inches tall with a roughly 120-inch diameter, holds 4000 gallons, and carries a 1.9 specific gravity rating - which is why buyers searching for a durable black vertical tank or a Snyder black tank land here. The black resin blocks light to discourage algae growth in stored water, and the 1.9 SG rating means the wall is built with heavy-duty margin to stand up to a full 104-inch water column and demanding water-service duty rather than light-service holding.
Will it work for your site?
Confirm two things: footprint and loaded weight. This is a vertical cylinder, so the 120 x 120 inch bounding box is really a ~120-inch diameter that needs a flat, round, fully supporting pad at least 120 inches across - our concrete pad sizing guide walks through the ACI framework. Filled with water this tank weighs about 33,360 lb, and at its full 1.9 SG rating it can carry up to 63,384 lb of contents, so the pad and any structure beneath it must be engineered for that load. That same 104-inch fill height is the static head the bottom flange and pad see, which matters for foundation design and outlet valve rating. Not sure this is the right capacity for your draw and refill cycle? Run the numbers with our Tank Sizing Calculator and Tank Sizing Guide. The heavy-duty build also suits demanding water roles such as rural fire-water reservoir and industrial water reuse storage trains.
Fittings and access
Per the technical drawing on this page, the tank is configured with a flange, an 18-inch polyethylene threaded/vented fitting, and a manway with 15-inch access for interior inspection and cleaning. The flange is the bulk fill/draw connection - confirm its bore, bolt pattern, and mating flange and gasket off the drawing before you buy plumbing, since those parts match at the drawing. Match the outlet, vent, and manway locations to your plumbing and platform layout before you order, because fitting placement is set at molding.
The mistake to avoid
Do not undersize the foundation for the loaded weight. Farmers and facility crews routinely plan for the empty tank and forget it will sit at 33,000-plus pounds full. Build the round pad and any elevated structure for the max rated contents weight, not the dry weight.
This tank ships LTL from the Snyder plant in Chowchilla, California - the nearest named shipping point for this SKU - with freight quoted live to your ZIP. Get your number with our Freight Cost Estimator, or call 866-418-1777 to talk through fittings, pad prep, and delivery.
