B-Series 8′ diameter

Home » Products » B-Series 8′ diameter

Integral ribs are added for strength.
Can be designed to H2O load conditions.
Easy to handle and install.
Cost effective storage alternative.
A fiberglass tank offers the best long-term protection against leakage due to both internal and external corrosion.
Water tanks are approved by NSF Standard 61 (potable water tanks).
Wastewater tanks are approved by CSA Standard B66.
Available in sizes from 2,000 imperial gallons to 15,000 imperial gallons (2,400 to 18,000 US Gallons).

Water & Wastewater
Model	Capacity (Imp. Gal.)	Capacity (US Gal.)	Dimensions		Weight (lbs.)
B2000S	2000	2400	9′ 2″L		900
B2500S	2500	3000	10′ 8″L		1100
B3000S	3000	3600	12′ 4″L		1300
B3500S	3500	4200	13′ 10″L		1500
B4000S	3889	4667	15′ 6″L		1800
B5000S	5000	6000	18′ 9″L		2050
B6000S	6000	7200	21′ 11″L		2375
B7000S	7000	8400	25′ 2″L		2750
B8000S	8060	9672	28′ 5″L		3100
B8500S	8500	10200	30′ 1″L		3300
B9000S	9076	10891	31′ 8″L		3450
B10000S	10000	12000	34′ 10″L		3750
B11000S	11084	13300	38′ 1″L		4250
B12000S	12000	14400	41′ 5″L		4500
B13000S	13120	15744	44′ 7″L		5500
B14000S	14033	16840	47′ 6″L		6250
B15000S	15000	18000	50′ 11″L		6500
B2000W	2000	2400	9′ 2″L		900
B2500W	2500	3000	10′ 8″L		1100
B3000W	3000	3600	12′ 4″L		1300
B3500W	3500	4200	13′ 10″L		1500
B4000W	4016	4819	15′ 6″L		1800
B5000W	5000	6000	18′ 9″L		2050
B6000W	6000	7200	21′ 11″L		2375
B7000W	7000	8400	25′ 2″L		2750
B8000W	8060	9672	28′ 5″L		3100
B8500W	8500	10200	30′ 1″L		3300
B9000W	9076	10891	31′ 8″L		3450
B10000W	10000	12000	34′ 10″L		3750
B11000W	11084	13300	38′ 1″L		4250
B12000W	12000	14400	41′ 5″L		4500
B13000W	13120	15744	44′ 7″L		5500
B14000W	14033	16840	47′ 6″L		3250
B15000W	15000	18000	50′ 11″L		6500

Additional accessories available (including divider walls, pump stand, manways, ladders, etc.). Comes with 30″ flanged collar (and lid).

For flanged manways and lids, please see extension page. For additional fittings or accessories please contact FRP/Mocoat Fiberglass Ltd.

Product Specification

Water & Wastewater
Model	Capacity (Imp. Gal.)	Capacity (US Gal.)	Dimensions		Weight (lbs.)
B2000S	2000	2400	9′ 2″L		900
B2500S	2500	3000	10′ 8″L		1100
B3000S	3000	3600	12′ 4″L		1300
B3500S	3500	4200	13′ 10″L		1500
B4000S	3889	4667	15′ 6″L		1800
B5000S	5000	6000	18′ 9″L		2050
B6000S	6000	7200	21′ 11″L		2375
B7000S	7000	8400	25′ 2″L		2750
B8000S	8060	9672	28′ 5″L		3100
B8500S	8500	10200	30′ 1″L		3300
B9000S	9076	10891	31′ 8″L		3450
B10000S	10000	12000	34′ 10″L		3750
B11000S	11084	13300	38′ 1″L		4250
B12000S	12000	14400	41′ 5″L		4500
B13000S	13120	15744	44′ 7″L		5500
B14000S	14033	16840	47′ 6″L		6250
B15000S	15000	18000	50′ 11″L		6500
B2000W	2000	2400	9′ 2″L		900
B2500W	2500	3000	10′ 8″L		1100
B3000W	3000	3600	12′ 4″L		1300
B3500W	3500	4200	13′ 10″L		1500
B4000W	4016	4819	15′ 6″L		1800
B5000W	5000	6000	18′ 9″L		2050
B6000W	6000	7200	21′ 11″L		2375
B7000W	7000	8400	25′ 2″L		2750
B8000W	8060	9672	28′ 5″L		3100
B8500W	8500	10200	30′ 1″L		3300
B9000W	9076	10891	31′ 8″L		3450
B10000W	10000	12000	34′ 10″L		3750
B11000W	11084	13300	38′ 1″L		4250
B12000W	12000	14400	41′ 5″L		4500
B13000W	13120	15744	44′ 7″L		5500
B14000W	14033	16840	47′ 6″L		3250
B15000W	15000	18000	50′ 11″L		6500

Frequently Asked Questions

Are FRP septic tanks approved for use in Washington State?

Yes. Every FRP septic tank we manufacture meets or exceeds CSA Standard B66, a key compliance benchmark for wastewater containment. These tanks are suitable for use across Washington in residential, industrial, and remote applications, where code-compliant, environmentally safe septic solutions are required.

What sizes do your fiberglass septic tanks come in?

We offer a variety of sizes to accommodate different needs – from small-capacity tanks for cabins and tiny homes, to larger systems for full-time residences, work camps, and commercial setups. Our team can help you select the right size based on your expected usage and site conditions.

How long do fiberglass septic tanks last?

With proper installation and maintenance, fiberglass septic tanks can last 40 years or more. Their corrosion resistance and seamless construction help prevent leaks and structural failures, even when buried underground for decades. That’s why many Washington property owners choose fiberglass over concrete or steel.

How does a fiberglass septic tank handle Washington’s wet and coastal regions?

Washington’s coastal zones, like those around Seattle or Bellingham, deal with high groundwater and fluctuating soil conditions. Fiberglass septic tanks are non-corrosive and watertight, making them a great fit for these environments. Their lightweight nature also allows for easier placement without the need for heavy equipment, even in challenging terrain.

Related Products

Ball Tanks in Washington

Double-Wall Fiberglass Tanks in Washington

Toilet Tank in Washington

Above-Ground FRP Tanks in Washington

Below-Ground Tanks in Washington

6′ Diameter Above Ground