Structural Composite

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Structural Composite

The non-corrosive, cost-effective solution for commercial/industrial water treatment and storage. Structural Composite Pressure Vessels offer fiberglass construction for outstanding performance and durability in harsh chemical enviroments. With capacities up to 1600 gallons and a variety of options, we can tailor a vessel to meet your needs. All Structural Composite Vessels are warranted for 5 years.

NEW! Pentair Structural Low Profile Composite Pressure Tanks, now available, featuring a space-saving design with the same capacity as the standard Structural Composite Pressure Vessels. The low-profile option, with a two-inch reduction to the flange, is the smart choice when space is a challenge.

This product is manufactured in the United States of foreign and domestic parts.

Features and Benefits

  • 100% composite fiberglass construction
  • Outstanding performance and durability in harsh chemical environments
  • Absolutely will not - and cannot - rust
  • Requires little or no maintenance
  • Capacities up to 2500 gallons
  • Factory-backed 5-year warranty
  • Materials of construction
    • Polyethylene inner shell



  • Safety factor: 4:1
  • Minimum burst at 600psi
  • Tested to 250,000 cycles without leakage


  • Safety factor: 4:1
  • Minimum burst at 600 psi
  • Tested to 100,000 cycles without leakage


  • Top/bottom flange
    • Safety factor: 5:1
    • Minimum burst at 750 psi
    • Tested to 33,000 cycles without leakage
  • Side flange
    • Safety factor: 6:1
    • Minimum burst at 900 psi
    • Tested to 100,000 cycles without leakage
  • Maximum operating pressure: 150 psi
  • Maximum operating temperature: 150° F (flanged), 120° F (threaded)


  • Vessels Tested and Certified by NSF International to NSF/ANSI Standard 61 for material and structural integrity requirements.


Printed copies also available at the Partner Center