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Piping and Sumps




FlexWorks Access Pipe Flex Pipe Removability Polyethylene Tank Sumps with Compression Fit Covers Fiberglass Tank Sumps with Mechanically Fastened Covers
(Injection Molded)
Polyethylene Tank Sumps with Mechanically Fastened Covers


FlexWorks Piping Double and Single Wall Tank Fitting Adapters Bolt and No-Bolt Styles Available Fiberglass Tank Sumps with Compression Fit Covers
(Filament Wound)
Fiberglass Tank Sumps with Mechanically Fastened Covers
(Filament Wound)

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FlexWorks Swivel Couplings

Swivel Couplings and Fittings for Primary Pipe

FlexWorks swivel couplings and fittings are used to interconnect flexible piping. These UL/ULC-listed stainless steel couplings must be contained within containment sumps and not directly buried. The pipe connection system includes an internally expanded stainless steel coupling attached to the end of a flexible pipe section.

Double-Wall Couplings Double-wall swivel couplings eliminate the need for cutting back the secondary jacket and rubber test boots. They have an integral interstitial access port for connector and test tubes.

These double-wall couplings permit higher interstitial testing pressures and eliminate added parts and labor costs.

Features and Benefits:

  • UL/ULC-listed for use with Flex piping
  • Quick, easy to install u All stainless steel couplings
  • Internally expanded couplings





Tank Sumps

Tank sumps function as a liquid tight isolation container providing secondary containment for the tanks fittings, valves, pumps and FlexWorks pipe fittings. They also provide surface access to the tank itself, as well as a clean, dry environment for future services and maintenance. All tank sump models have height adjustable risers to accommodate different tank burial depths. Each sump model has its own specific range of height adjustability, and are fabricated and assembled at the job site. OPW-FCS one piece polyethylene tank sumps are listed with Underwriters Laboratories, Inc., (UL), and have passed the requirements for Canada at Underwriters Laboratories of Canada (ULC), KEWA and IP.

Tank Sump Features

  • Liquid tight covers
  • Liquid tight riser/base joints
  • Chemically compatible
  • Structurally strong
  • Height adjustable
  • Liquid tight pipe entries
  • Liquid tight tank connections
  • UL/ULC listed

Full Selection

Tank sumps are available in a variety of styles and sizes to accommodate most tank fitting configurations, tank collars and tank burial depths. All OPW-FCS tank sumps feature patented watertight covers. Patented flexible entry boots are also available for sealing pipe and conduit entries. All sumps are made of materials which are compatible with all EPA approved fuels & additives and should not crack or break under burial loads. Tank sumps are available in both polyethylene or fiberglass.

  • Fiberglass Tank Sump with Mechanically Fastened Covers (available in injection molded or filament wound)
  • Polyethylene Tank Sump with Compression Fit Covers
  • Polyethylene Tank Sump with Mechanically Fastened Covers
  • Fiberglass Tank Sump with Compression Fit Covers



FlexWorks Piping

FlexWorks Piping is a smooth bore flexible double wall piping system with a history of environmental safety.

FlexWorks piping is a UL / ULC Listed flexible underground piping system primarily used for the transmission of fuels from underground storage tanks to above ground fueling dispensers. The piping is available in single wall and in double wall coaxial construction and is shipped in rolls or reels to provide continuous piping runs therefore reducing the number of piping connections.


  • Flexible construction
  • Continuous pipe length
  • Double wall construction
  • Decreased installation time
  • Smooth bore construction


  • Accommodates various site installations
  • No joints: minimizing leak potential
  • Provides increased environmental safety
  • Reduced material and labor cost
  • Increased flow capability





OPW Dis Sumps
OPW Dispinser Sumps

One-Piece Polyethylene Dispenser Sumps

FlexWorks Dispenser Sumps are installed beneath fuel dispensers to provide access to and secondary containment of dispenser plumbing, emergency shear valves and underground piping connections. Stabilizer Bar Kits are installed in FlexWorks Dispenser Sumps to provide reliable support for boss-mounted emergency shear valves.

Features and Benefits:

  • Multiple Models – ensure a custom fit.
  • Structural Reinforcing on Large MPD Models – prevents sump deformation from backfill and high water table forces.
  • Light Color – preserves rigidity in sunlight before backfill and provides maximum visibility after installation.
  • Full Perimeter Liquid Collection Channel – facilitates quick leak detection and allows flexibility in locating leak sensors.
  • Integral Rain Lip – protrudes into the dispenser frame to prevent surface water entry.
  • Easy Installation – field height adjustment capability and large pipe entry area ensures installation flexibility.
  • Available in a Conduitless Model – eliminates conduit entry fittings and prevents a notorious leak point inside dispenser sumps.




Please call 1-800-845-4357 for a complete list of our available products. 

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