Available in 18, 24, 30, 36, 42, 48 and 60 in. inside diameters
Depths available up to 240 inches, in increments of 6 in.
Winding process is computer controlled for accuracy, consistent thinkness and extraordinary strength
Manufactured to the ASTM D 3753: Standard Specification for Glass - Fiber - Reinforced Polyester Manholes and Wet Wells
Designed to withstand wall collapse or buckling based on: Hydrostatic pressure of 62.4 lbs. per square foot, saturated soil weight of 120 lbs. per cubic foot and soil modulus of 700 lbs. per square foot
