FlexRake® FP

Full Penetration Coarse Screen

greater than ½ in openings

The workhorse that set the standard for simplicity in the water and wastewater industry

For difficult-to-capture debris

The FlexRake® Full Penetration (FP) model offers multi-rake coarse screening for openings greater than ½ inch. It combines rugged Adaptive Technology™ from the FlexRake’s flood control origins and is specifically engineered to manage sticky or difficult-to capture debris, making it ideal for wastewater and industrial applications.

The FlexRake has evolved to meet the requirements of multiple industries. Wherever applied, it is a workhorse that just keeps running. The inherent value of the FlexRake is its simplicity: long product life, low cost of ownership, and adaptability to a range of site conditions (varied flows, debris types, and volumes). Duperon Corporation is continuously reinventing what is possible for simplicity in screening.

Wastewater & Collection Systems Applications:

  • Preliminary treatment
  • Headworks
  • Pump stations
  • Lift stations
  • Combined sewer overflows
  • Prisons

Industrial Applications:

  • Pulp and paper mills
  • Food and beverage

Open Channel Applications:

  • Power generation
  • Raw water intakes
  • And other applications where debris is highly variable or difficult-to-capture.

The Duperon®

The Duperon®
FlexRake® FP

Flexible design

Adapts to a range of unpredictable flow and debris conditions without operator intervention

Process resilience

Effective coarse solids removal through a broad range of flow and debris conditions so downstream assets remain protected

Reliable operation

The FlexRake FP adapts to handles grease, grit, first flushes, rags, large or unusual debris (2×4’s, bricks or sewer plugs) without shutdown or operator intervention

Low cost of ownership

With few parts and minimal maintenance required, the FlexRake FP is easy to install, own, and operate

No in-channel maintenance

Everything is serviceable from the deck, eliminating confined space entries, jamming and routine in-channel maintenance


Engineered to fit the unique needs of your site

You’ll like
working with us

Our biggest benefit? We eliminated approximately 15 confined space entries a year

Randy Sommers
Superintendent, City of Monroe, MI

Terry Duperon

Our story is simple

Our Story Is Simple

Duperon entered the municipal market in 1997 when wastewater operators saw the FlexRake® at a conference. Like many cities, the City of Adrian wastewater plant was facing the rising cost of ownership of their existing aging equipment. Their bar screen was designed with lower sprockets—below the deck—that needed frequent servicing and replacement. This was a costly task that required a confined space entry and a three-person crew. Seeing the obvious simplicity of the FlexRake design, and the lack of underwater sprockets, Duperon and the City of Adrian entered into a pilot agreement in 1998– that became an enduring partnership. More than 20 years later, that same unit (plus two others) are still in operation, running 24/7 and have set the standard for simplicity in the water and wastewater industry.

In 2018, the FlexRake at City of Adrian WWTP celebrated 20 years of trouble-free, 24/7 operation Read more

How can we help


The FlexRake® FP is a front-clean, front-return, mechanically cleaned bar screen. It features the industry-leading FlexLink™ multifunctional link system, which eliminates underwater sprockets, bearings or tracks that create a fixed path of travel and are subject to fouling and/or jamming. The groundbreaking flex/pivot action of the Duperon FlexRake is unhampered by large debris.

The FlexRake FP is a coarse screen that utilizes individually replaceable, stainless steel, rectangular bars with ⅝ inch to 4 inch openings. The UHMW-PE Thru-Bar™ scrapers eliminate accumulation by cleaning all three sides of the bar and cross members to remove hard-to-capture debris.

General Specs

Typical Applications Wastewater & Collection Systems Applications 

  • Preliminary treatment
  • Headworks
  • Pump stations
  • Lift stations 
  • Combined sewer overflows
  • Prisons

Industrial Applications:

  • Pulp and paper mills
  • Food and beverage

Open Channel Applications: 

  • Power generation 
  • Raw water intakes
  • And other applications where debris is highly variable, tends to wrap/cling, or is difficult-to-capture.
Unit Width 2 ft to 12 ft
Unit Length 10 ft to 100 ft
Bar Openings ⅝ in to 4 in 
Bar Shape Rectangular Bar
Scraper Configuration  UHMW-PE Thru-Bar™ scrapers that clean all sides of the bar and the cross member
Material of Construction  Available in 304 or 316 Stainless Steel
Flow Capacity  Designed to your site 
Cleaning Frequency 1 discharge/minute on low

4 discharges/minute on high 

Lifting Capacity 1000 lbs

3000 lbs option available

Angle of Installation Vertical to 45 degrees, dependent upon site conditions
Typical Motor ½ hp inverter duty, explosion proof
Standard Controls Packages range from simple start/stop to sophisticated automation.

Motor overload protection provided.

Operation Options Continuous/Manual

Automatic with timer, float, SCADA, differential/high-level sensing options with I/O as needed

Key Features

Industry-leading FlexLink™ eliminates lower sprockets, submerged bearings and tracks

FlexLink multifunctional link system has ultimate strength of 60,000 lbs with unmatched durability

Full-Range Flexibility adapts to debris variations; from grit and grease to hard hats and sewer plugs

Jam-Evasion™ Technology lifts or pivots to process large debris without shutdown or jamming

High-capture Thru-Bar™ cleaning cleans all three sides of the bar and the cross member

Fractional horsepower motors used for energy efficiency

5 year warranty for wastewater applications

Everything is serviceable from the deck to eliminate in-channel maintenance and confined space entries


FlexRake FP

Photo Gallery

Case Studies

Related Products

Duperon® Dual Auger System

Dual Auger System

¾ in bar opening

Coarse, slotted 5 in 1 bar screen with vertical dual augers and discharge extension chute that captures, dewaters, compacts, transports and stores screenings. Ideal for flushable wipes. Connects to sewer inlets.

Duperon® FlexRake IQ®

FlexRake IQ

⅛ in – 4 in bar openings

In-channel fine or coarse, slotted bar screen with re-imagined FlexLink™ and Thru-Bar™ technology. Smart Raking™ enhancements and Smart LogIQ™ Sequence of Operations.

Duperon® FlexRake IQ2®

FlexRake IQ 2

¼ in – 4 in bar openings

In-channel fine or coarse, slotted bar screen with re-imagined FlexLink and Thru-Bar™ technology. Smart Raking™ enhancements, Smart Bar Screen®, and Smart LogIQ™ Sequence of Operations.

Duperon® FlexRake® FPFS

FlexRake FPFS

¼ in – ½ in bar openings

Fine, slotted bar screen with FlexLink™ and SSTL Thru-Bar™ technology. Ideal for ‘sticky’ or matting debris. SSTL construction.

See how the FlexRakes at one municipality endured back-to-back hurricanes flawlessly, improved worker safety, reduced maintenance and managed profound grit. Read case study

Tell us about your project

‘You’ll like working with us’ is a commitment and the way we deliver extraordinary customer care for the full life-cycle of your equipment. This is how we strive to earn the privilege to serve your continued screening needs.


Design Collaboration

To build your solution, our engineers take the time to understand your facility, process, and goals.

We’ll combine our team’s experience with water screening, cleaning, and processing with your team’s detailed understanding of your product and process, so we can develop a reliable and cost-effective solution.