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LFM (800) 237-5791
FSI (800) 953-8208

Wetwells (Large Diameter)

Light-weight. Corrosion Resistant. Economical


Let us put our experience to work for you. LFM has been building quality fiberglass reinforced manholes and wetwells since 1982. We utilize the latest in chop and filament winding equipment, therefore providing our customers with the highest quality fiberglass products on the market today. Our production facility is located on 35 acres near Giddings, Texas and covers 83,000 square feet.  

fiberglass wetwell

Quality Built Right In

LFM incorporates a comprehensive in-plant testing program. Our quality control enables us to provide our customers with consistent workmanship in every fiberglass wetwell that we build. We inspect and test each fiberglass wetwell before it is released for shipping. Wall thickness reports, raw material analysis and continuous chemical analysis reports are just some of the test procedures that we perform. Testing reports are recorded and maintained at our office, and are available upon request. 


Fiberglass wetwells and basins by LFM are light-weight, making them easier to handle. This means easier, safer, faster and less costly installations. 

Available Diameters

LFM builds fiberglass manholes to your specified dimensions with standard diameters from 36 inches through 15 & 1/2 feet. Depths are available from 2 feet through 40 feet. Greater depths can be custom fabricated. Ask your LFM sales representative for details. We manufacture several different wall thicknesses for different load, depth and diameter specifications. LFM also incorporates a ribbed wall system into wetwells requiring added strength. Reinforced FRP tops and bottoms are also available. Contact your LFM sales representative to find out which dimensions best suit your needs. 


LFM can build fiberglass wetwells to fit your specific requirements complete with pipe stubouts already in place, making installation easier and less time consuming. We also offer alternative methods for connecting pipe to our fiberglass wetwells such as Kor-N-SealTM boots, as well as connectors from other manufacturers. 

Quality Assurance

We stand behind the products that we build. Our fiberglass wetwells carry a one year limited warranty. For additional information, see the warranty section of our brochure.

Made in the USA logo

Summary of Test Results
Tests Performed Average Results
Stiffness 5% Deflection @ 2.45 lbs. / in.02
10% Deflection @ 2.28 lbs. / in.2
Material Composition 54.25 wt. % Resin
Compressive Strength Transverse: 22,700 psi
Longitudinal: 10,500 psi
Flexural Strength Transverse: 56,000 psi
Longitudinal: 11,700 psi
Modulus Transverse: 2,084,000 psi
Longitudinal: 1,114,000 psi
Load Rating 24,000 lbs. - 0.157” Deflection
40,000 lbs. - No Damage
Barcol Hardness Cylinder: 43.1
Reducer: 41.0
Wall Thickness Cylinder: 0.308
Soundness No Leaks Detected at 5 psi Air Pressure