Centurion M3.3 3-Valve Chemical Metering System, 12 GPM, 300 PSI

Centurion M3.3: Precise Metering for High-Performance Soft Wash Metering System and Pressure Systems

The Centurion M3.3 is a chemical proportioning and metering system built by Barens to blend water, bleach, and surfactants on demand through three independent metering legs. Instead of bucket mixing or guessing ratios, operators rely on properly set mixing valves and then pull the trigger; the system delivers a consistent blend every time, cutting chemical waste and eliminating downtime between mix changes. The M3.3 comes pre-assembled on an aluminum mounting bracket and is sized to pair directly with Centurion high-pressure pumps, including the 4 GPM direct-drive models, so the metering system and the pump work as a matched pair from the same source at a sale price below regular price.

Why You'll Love the Centurion M3.3 Metering System

Faster setup, repeatable results, and longer equipment life; those are the outcomes that matter on a job site, and the M3.3 delivers all three.

• Accurate mix every pull of the trigger – The system uses three precision metering valves for chemical flow control, one each for water, sodium hypochlorite (SH), and soap. Because each leg is independently adjustable, you can dial in exact ratios for roofs, siding, and flatwork and hit the same blend every time. A common mix for house washing is 100% water, 25% SH, and 10% soap; for roof cleaning, use a mix of 100% water, 80% SH, and 20% soap. Those presets stay locked until you change them.

• No more bucket mixing or guesswork – onboard metering replaces manual pre-mix tanks entirely. That means less handling of concentrated bleach, fewer spills on the trailer, and no wasted material sitting in a tank at the end of the day. Blend manifolds save material costs on every job by dispensing only what the valve settings call for.

• Faster job turnaround – Operators can switch between different cleaning ratios without stopping the system. Going from a light house wash to a heavy roof mix takes a few valve turns, not a tank swap. For contractors running multiple jobs per day, that adds up to real time and money saved.

• Lower chemical and maintenance costs – Over-applying bleach damages surfaces and burns through product. Metering valves allow precise control of cleaner amounts to reduce costs, and the system improves chemical efficiency and reduces waste. Less chemical abuse also means less corrosion inside the pump, hoses, and fittings.

• Built for daily field use – the aluminum bracket, chemical-resistant seals made from PEEK and Viton, and integrated check valves that prevent backflow all combine to create a manifold that can live on a trailer year-round. These parts withstand sodium hypochlorite exposure that destroys standard rubber seals within weeks.

• Simple to train new operators – The M3.3 features an 8-inch labeled clear manifold for monitoring chemical flow. New crew members can see whether bleach and soap are actually flowing, and the labeled valve positions make it easy to hand off work without a long training session.

What Makes the Centurion M3.3 Different

Most generic blend manifolds rely on basic ball valves that are either fully open or mostly closed, with no fine control in between. Their fittings are often standard NBR rubber that degrades after a few weeks of exposure to bleach, and the valve layout is cramped, unlabeled, and hard to reach mid-job. The Centurion M3.3 solves each of those problems by design.

• Engineered around Centurion flow ranges, the M3.3 is tuned for 3–4 GPM working flows. Its ¾-inch main path and sized branches feed a Centurion 4 GPM, 4,000 PSI pump without restricting flow or causing pressure drop at the inlet. That alignment between the metering system and the pump eliminates surging and cavitation that occur when generic manifolds bottleneck a high-flow pump.

• Dedicated metering on three legs – Unlike generic setups, the M3.3 uses precision mixing valves to accurately control dilution. The M3.3 gives each chemical its own precision valve so you can fine-tune one leg without affecting the others. It can mix multiple cleaners for different applications and allows easy adjustment of mixing ratios.

• Chemical-tough construction – While cheaper manifolds use generic rubber seals, the M3.3 uses PEEK (polyether ether ketone) and Viton, both rated for prolonged exposure to bleach and detergents. The corrosion-resistant body and hardware resist the salt buildup and UV exposure common on trailer-mounted rigs.

• Compact, serviceable layout – The manifold's logically grouped inlets (water, bleach, soap) and single blended outlet simplify hose routing. Pre-drilled mounting points line up with standard skid plates and trailer rails, so installation takes common tools and a short lunch break, not a full rebuild.

• Built by Barens for Barens and Centurion systems – One source for the metering system, pump, and critical parts. That means matched plumbing sizes, compatible materials, and a single point of contact for support when you need to add or replace components.

How the Centurion M3.3 Metering Valve System Works

The M3.3 is a three-leg proportioning manifold: it pulls water, bleach, and detergent from separate tanks and blends them on the fly before the mixed stream reaches your Centurion pump inlet. It allows operators to mix water, bleach, and surfactants on demand in a three-step process.

1. Connect your tanks and lines – Run a supply line from your water tank to the water inlet, from your sodium hypochlorite tank to the bleach inlet, and from your detergent tank to the soap inlet. The single blended outlet connects to the pump inlet. The design simplifies installation and setup time on cleaning rigs; the pre-assembled bracket and fittings keep the process straightforward.

2. Set your mix with the metering valves – Turn each labeled metering valve to your target position. The labeled mixing valves help dial in the dilution needed for each cleaning task. For a standard house wash, open the water valve fully, set SH to roughly 25%, and soap to about 10%. For stubborn stains on roofs, increase SH to 80% and soap to 20%. The clear manifold section lets you visually confirm flow through each leg before you start spraying.

3. Pull the trigger and let it blend – As the pump draws suction, the M3.3 proportionally pulls each liquid at the ratio you set. The blend remains consistent as long as the valve positions remain fixed. If you need to adjust mid-job, open or close the bleach or soap valve slightly without shutting down; the system responds in real time, allowing on-demand mixing and adjustment of cleaning ratios.

When paired with a Centurion 4 GPM pump and properly sized ¾-inch inlet plumbing, the M3.3 feeds a steady, air-free supply. That means no surging at the wand, no cavitation at the pump head, and smoother operation from the first trigger pull to the last.

Product Details: Centurion M3.3 Metering System and Mixing Valves Specifications

Quick reference for installers and buyers planning a new skid build or retrofit.

• Flow range – Designed for 3.0–4.0 GPM working flow, matching professional soft wash and high-pressure cleaning systems

• Circuit configuration – Three independent metering legs (water, sodium hypochlorite, detergent) with individual control valves; a blend manifold can have multiple metering valves for different cleaners

• Valve type and sizing – Three ¾-inch precision metering valves sized to balance flow and fine adjustability across all three chemical legs

• Materials – Corrosion-resistant aluminum bracket and hardware; chemical-resistant seals made from PEEK and Viton; integrated check valves prevent backflow and cross-contamination between tanks

• Visual monitoring – 8-inch labeled clear manifold section for real-time confirmation of chemical flow through each leg

• Mounting and footprint – Compact footprint with pre-drilled mounting points for standard skid plates and trailer rails; the system comes pre-assembled on an aluminum mounting bracket for fast installation

• Port orientation – Logically grouped inlets (water / bleach / soap) and a single blended outlet, designed to simplify clean hose routing to the pump

• What's included – Assembled M3.3 manifold, mounting hardware, hose barb or threaded fittings for main ports, and installation/operation guide

• Recommended companions – Pair with a Centurion 4 GPM direct-drive pump and Barens-built skids to create a complete soft wash system

Who the Centurion M3.3 Metering System Is For

The system is designed for soft-washing and pressure-washing applications where crews depend on repeatable chemistry every day.

• Professional soft-wash and pressure-washing contractors – If you're washing residential and commercial exteriors, roofs, and flatwork, the M3.3 lets your crew switch between house wash, roof mix, and rinse settings in seconds. Repeatable ratios mean consistent results across every property, every day.

• Fleet and facility maintenance teams – Wash bays servicing trucks, loading docks, and heavy equipment need precise chemical control to protect paint and finishes. Over-applying bleach or detergent damages surfaces and wastes product. The M3.3's proportioner design keeps ratios locked to what the job requires.

• Agricultural and ranch operations – Barn sanitation, pen cleaning, and equipment degreasing all require bleach and detergent blends that can corrode metal if over-concentrated. The M3.3 delivers the right ratio every time, protecting expensive equipment in the long run.

• Small industrial and manufacturing plants – Parts washing, process-area wipe-downs, and general plant sanitation need predictable detergent and sanitizer ratios shift after shift. The M3.3 removes guesswork from those routines.

If you're already running or planning a Centurion 4 GPM pump, the M3.3 is the natural metering upgrade.

How to Set Up and Dial In Your Centurion M3.3 System

The correct setup protects the pump, improves cleaning, and extends the life of every component, from the metering valves to the spray tip.

Plan your layout – Mount the manifold where operators can reach all three valves without climbing over hoses or tank straps. Run straight, non-kinked lines from each tank to the M3.3 inlets; short runs with ¾-inch plumbing reduce restriction and prevent air from being trapped in the lines.

Match your flow to your Centurion pump – Size the inlet plumbing so the M3.3 can comfortably feed a 4 GPM Centurion pump at 4,000 PSI. If the supply lines are too narrow or too long, the pump will starve for flow. Keep hose runs as short as practical and eliminate 90-degree fittings wherever possible.

Label your valve positions – Mark common settings directly on the panel. "House Wash," "Roof Mix," and "Rinse" labels let any tech on the crew switch recipes quickly without having to remember valve turn counts. This is where the M3.3's labeled clear manifold section pays off; you can visually confirm that flow matches the expected set point.

Prime and flush correctly – Fill all lines with water first by opening the water valve fully and leaving the bleach and soap valves closed. Once the water leg is primed and air-free, slowly open the chemical valves. Air pockets in the bleach or soap lines cause cavitation and inconsistent draw. Properly flushing the mixing valves helps prevent residue buildup and maintain consistent ratios.

Verify mix strength in the field – Start with a small test patch on siding or concrete before committing to a full surface. Adjust valves slightly rather than opening the bleach valve wide from the start. Gradual tuning prevents over-concentration and protects the surface you are cleaning.

Keeping Your Centurion M3.3 Metering System Working for Years

Light, regular maintenance extends the life of both the metering system and any connected Centurion pumps. Neglecting rinse-out is the single fastest way to shorten valve and seal life.

Daily rinse-out – Finish every shift by running fresh water through the M3.3 for 5–10 minutes. Flushing the system should last 5–10 minutes after use to clear bleach and detergent residue from the metering valves, check valves, and clear the manifold section. Residual SH left overnight crystallizes and scores valve seats.

Inspect valves and fittings – Check weekly for stiffness, leaks, or white salt buildup around the metering valve stems and connection points. A valve that is getting harder to turn is telling you that chemical residue is building up inside.

Replace wear components on schedule – PEEK and Viton seals resist bleach far longer than standard rubber, but they are not permanent. Plan periodic seal and seat replacement based on hours of use and the concentration of SH you run. Keep a small kit of critical spares on the truck so a worn seal does not shut down an entire day.

Protect from weather and UV – Shield the manifold from direct sunlight and standing water. UV degrades the labeled markings on the clear manifold section and accelerates aging of any exposed rubber or plastic fittings.

Winterize before freezing conditions – Flush with clean water, then run a compatible antifreeze or pump-saver solution through every leg. Drain all lines and store trailer-mounted rigs in a dry, frost-free location whenever possible.

Frequently Asked Questions

Common questions about pairing the Centurion M3.3 with Centurion 4 GPM pumps and other Barens systems.

Is the Centurion M3.3 easy to use? Yes. The labeled valves and clear manifold section give operators immediate visual feedback. New crew members can be trained in minutes by setting the valves to pre-marked positions and confirming flow through the clear section.

Will it work with a Centurion 4 GPM, 4,000 PSI pump? The M3.3 is designed for flows in that range and is an ideal match for Centurion triplex pumps. Follow the ¾-inch inlet plumbing guidelines and keep supply lines short to avoid flow restriction.

Can I adjust mix strength while I'm spraying? Yes. Operators can fine-tune ratios by slightly opening or closing the bleach and soap valves without shutting down the system. Make changes gradually; a quarter-turn at a time keeps the blend predictable.

What kind of chemicals can I run through it? The M3.3 is optimized for water, sodium hypochlorite, and typical soft wash detergents. The PEEK and Viton seals handle those chemicals well. Check with Barens before running unusually aggressive acids or solvents through the system.

How long will the valves and seals last? With daily rinsing and basic care, users can expect multi-season service from the valves and seals. Service kits with replacement parts are available through Barens distribution.

Can I retrofit the M3.3 onto an existing skid? Most owners can integrate it using common tools, especially if the rig already has ¾-inch plumbing. In many cases, you can bring the unit into an existing setup without a full rebuild. The pre-drilled aluminum bracket fits standard skid plates and trailer rails.

Ready to Upgrade Your Chemical Control?

Stop wasting time with bucket mixing and inconsistent ratios that burn through bleach and leave surfaces half-cleaned. The Centurion M3.3 soft wash metering system delivers precise, repeatable blends through three independent metering legs, letting your Centurion 4 GPM pump do its best work on every job.

Contact Barens to spec your Centurion M3.3 metering system, or add it to your next skid build at the sale price shown below the regular price. One manifold, matched to your Centurion pump, backed by the same team that built it.