Multiquip WT5C: Complete Guide to the 525-Gallon Water Trailer, Pump, Uses, and Specifications

The Multiquip WT5C is a heavy-duty mobile water trailer designed for construction, dust control, equipment washdown, agricultural support, emergency response, and other applications where a dependable portable water supply is required. Built around a rugged dual-axle trailer, a large polyethylene water tank, and a high-flow Multiquip centrifugal pump, the WT5C is designed to move water efficiently across jobsites where a fixed water connection may not be available.

For contractors, municipalities, rental companies, road crews, landscapers, and utility teams, the WT5C provides a practical way to transport more than 500 gallons of water while also supplying pressure for spray bars, hoses, filling operations, and general water transfer.

Current WT5C configurations use a 525-gallon polyethylene tank, a Multiquip QP2H 2-inch centrifugal pump, a Honda GX120 engine, and a DOT-approved dual-axle trailer with surge brakes.

What Is the Multiquip WT5C?

The Multiquip WT5C is a trailer-mounted mobile water system.

Instead of simply carrying a static tank, it combines:

• Water storage

• Pumping

• Suction capability

• Pressurized discharge

• Spray-bar distribution

• Hose connections

• Road-ready trailer transportation

This makes the WT5C useful on jobsites where water must be transported, distributed, sprayed, or transferred repeatedly.

Common users include:

• Concrete contractors

• Road construction companies

• Utility crews

• Municipalities

• Rental businesses

• Landscape contractors

• Agricultural operations

• Equipment fleets

• Emergency-response organizations

Multiquip originally positioned the WT5C as a highly versatile fleet product for applications including dust control, equipment washdown, agricultural support, and firefighting response.

Multiquip WT5C Specifications

The current WT5C is commonly listed with the following specifications:

• Tank capacity: 525 gallons

• Pump: Multiquip QP2H centrifugal pump

• Pump size: 2 inches

• Maximum flow: approximately 158 GPM

• Maximum head: approximately 115 feet

• Engine: Honda GX120

• Trailer: DOT-approved dual axle

• Brake type: Hydraulic surge brakes

• Hitch: 2 5/16-inch ball on current standard listings

• Dry weight: approximately 1,428 pounds

• Rear spray bar

• Suction and discharge manifold system

The WTE5C is a closely related version that uses electric trailer brakes instead of the WT5C’s hydraulic surge-brake system.

Exact specifications can vary with production year and installed options, so the machine identification plate and current Multiquip documentation should always be checked before ordering parts or accessories.

525-Gallon Water Tank

One of the most important WT5C features is its large polyethylene water tank.

The tank provides approximately 525 gallons of water capacity, giving contractors enough supply for substantial dust-control, washing, and jobsite support work before refilling.

The tank includes internal baffles.

These baffles help control water movement while the trailer is being transported.

Without baffles, hundreds of gallons of water can shift aggressively during:

• Braking

• Acceleration

• Cornering

• Lane changes

• Uneven terrain

Reducing this water movement helps improve towing stability.

How Much Does 525 Gallons of Water Weigh?

Water weighs roughly 8.34 pounds per gallon.

That means 525 gallons of water alone weighs approximately:

4,379 pounds

Once the trailer, pump, hoses, tank, accessories, and water are included, the loaded system becomes a substantial towing load.

This is why the tow vehicle, receiver hitch, tires, brakes, ball mount, and coupler all need to be correctly rated for the complete loaded trailer.

Never select a tow vehicle based only on the dry trailer weight.

Multiquip QP2H Pump

The WT5C uses the Multiquip QP2H 2-inch centrifugal pump.

This pump provides high-flow water delivery for applications where moving a large volume of water quickly is more important than extremely high pressure.

The WT5C’s current published specifications list output of roughly 158 gallons per minute and approximately 115 feet of maximum head.

This allows the trailer to support applications such as:

• Filling

• Water transfer

• Dust suppression

• Spray-bar use

• Equipment washdown

• General construction water supply

The QP2H is powered by a Honda GX120 gasoline engine.

Honda GX120 Engine

The Honda GX120 is a compact commercial gasoline engine commonly used on pumps and construction equipment.

Its advantages include:

• Reliable starting

• Simple maintenance

• Broad service support

• Commercial-duty construction

• Portable gasoline operation

Because the pump has its own engine, the WT5C does not depend on PTO power from the tow vehicle.

This allows the trailer to operate independently after arriving at the jobsite.

Routine engine maintenance should include:

• Oil inspection

• Oil changes

• Air-filter service

• Spark-plug inspection

• Fuel-system checks

• Fastener inspection

Always follow the Honda engine maintenance schedule for the exact engine installed.

Suction and Discharge Manifold

The WT5C includes a flexible suction and discharge manifold system.

One of the major advantages of this design is that the operator can switch between suction and discharge functions through a relatively simple valve arrangement.

Multiquip describes the system as allowing operators to change between suction and discharge modes using a manifold lever.

This is useful when the trailer needs to:

• Fill itself from an external water source

• Pump water out of the tank

• Feed the rear spray bar

• Supply a discharge hose

• Transfer water between locations

The manifold components are mounted in a relatively protected position on the trailer to reduce jobsite damage.

Rear Spray Bar

The rear spray bar is one of the most useful features for construction and road work.

It distributes water behind the trailer as the tow vehicle moves.

Applications include:

• Dust control

• Gravel-road wetting

• Construction-site dust suppression

• Soil moisture conditioning

• Road maintenance

• Site cleanup

Dealer specifications indicate the dual-nozzle rear spray system can provide a wide distribution pattern, making it useful for treating larger areas efficiently.

The spray bar may operate using pressurized or gravity-feed settings depending on the configuration and operating procedure.

WT5C for Dust Control

Dust control is one of the primary applications for the WT5C.

Construction sites can create dust from:

• Grading

• Excavation

• Demolition

• Crushed aggregate

• Unpaved access roads

• Vehicle movement

• Site preparation

Applying water helps keep fine particles from becoming airborne.

The WT5C allows crews to tow water directly to the dusty area rather than relying on fixed hoses or stationary water sources.

This can be particularly useful on:

• Large commercial sites

• Road projects

• Remote construction

• Quarries

• Utility work

WT5C for Concrete Construction

Concrete contractors may use a water trailer for:

• Saw-cutting support

• Equipment cleaning

• Slurry cleanup

• Dust suppression

• Site wetting

• General water supply

The trailer may also provide water in locations where temporary construction services have not yet been installed.

It should not automatically be treated as a potable-water system. Multiquip-related listings specifically note that the WT5-series system is not certified for potable water and is not intended for saltwater or certain chemicals.

WT5C for Equipment Washdown

Construction equipment accumulates:

• Mud

• Concrete residue

• Dust

• Aggregate fines

• Asphalt debris

• Soil

Having a mobile water supply allows crews to clean equipment before material hardens.

The WT5C may be used for washing:

• Plate compactors

• Concrete saws

• Excavators

• Skid steers

• Rollers

• Paving equipment

• Trucks

• Landscape equipment

For more concentrated washing pressure, contractors should consider whether the standard WT5C’s high-flow pump or one of Multiquip’s higher-pressure WT5HP-type configurations better matches the application.

WT5C for Agricultural Support

Agricultural applications may include:

• Water transport

• Field support

• Equipment cleaning

• Dust suppression

• Temporary water supply

The trailer’s mobility makes it useful on large properties where a permanent water line is not conveniently located.

However, the WT5C should only carry materials approved for the tank, pump, seals, and hoses.

Emergency Firefighting Support

Multiquip lists emergency firefighting response among the WT5C’s intended applications.

The large tank and pump allow water to be transported to areas where hydrants may be unavailable.

Possible support uses include:

• Property protection

• Construction-site emergency response

• Agricultural fire response

• Remote-site support

A water trailer should not be assumed to replace certified fire apparatus.

Firefighting use should follow applicable local regulations and emergency procedures.

WT5C Surge Brakes

The standard WT5C uses hydraulic surge brakes.

Surge brakes operate automatically when the trailer pushes forward against the tow vehicle during braking.

This movement activates the trailer braking system without requiring a conventional electric brake controller.

Benefits include:

• Automatic braking action

• Simpler tow-vehicle setup

• Good utility-trailer functionality

The related WTE5C uses electric brakes instead.

Electric brakes may be preferred by operators who want greater brake-controller adjustment from inside the tow vehicle.

WT5C vs WTE5C

The biggest distinction is trailer braking.

WT5C

Uses hydraulic surge brakes.

WTE5C

Uses electric trailer brakes.

Both use the same general 525-gallon mobile-water-trailer concept with the Multiquip centrifugal pump.

The correct model depends on:

• Tow vehicle

• Brake-controller setup

• Fleet preferences

• Local requirements

• Operator preference

WT5C vs WT5HP

The WT5HP is a higher-pressure alternative within the water-trailer family.

Published specifications show:

WT5C

• Approximately 158 GPM

• Approximately 115 feet maximum head

• Honda GX120

WT5HP

• Approximately 106 GPM

• Approximately 230 feet maximum head

• Honda GX160

The WT5C favors higher flow, while the WT5HP sacrifices some flow volume for greater pressure capability.

For basic dust control and water transfer, the WT5C may be ideal.

For applications requiring stronger jetting pressure, the WT5HP may be more appropriate.

Filling the WT5C

The water tank can be filled through dedicated fill systems.

Multiquip documentation has described both a large vented fill opening and a connection designed for faster filling through external water sources.

Before filling:

1. Park on level ground.

2. Verify the drain is closed.

3. Inspect the tank.

4. Confirm the water source is appropriate.

5. Avoid overfilling.

6. Close the fill opening securely before towing.

Remember that every gallon dramatically increases the trailer’s total weight.

Towing the WT5C

Before towing:

• Confirm the tow vehicle rating.

• Verify the correct hitch ball.

• Inspect the coupler.

• Attach safety chains.

• Check trailer brakes.

• Inspect tires.

• Check wheel lugs.

• Connect trailer lights.

• Confirm the tank fill cap is secure.

• Secure hoses and accessories.

When towing a partially filled tank, water movement can still affect handling even with internal baffles.

Drive conservatively.

Allow extra braking distance and avoid aggressive cornering.

WT5C Hose Options

Water-trailer accessories may include:

• 2-inch suction hoses

• Quick-disconnect suction hoses

• Discharge hoses

• Fire-hydrant discharge hose

• Hose reel assemblies

Published Multiquip accessory listings include a 1-inch by 50-foot hose reel assembly as well as several 2-inch suction and discharge hose options.

The correct hose should be selected according to:

• Suction or discharge use

• Diameter

• Pressure rating

• Coupler type

• Required length

Do not substitute an unreinforced discharge hose for a suction hose, because vacuum pressure can collapse unsuitable hose material.

WT5C Maintenance

Regular maintenance should cover both the pump system and trailer.

Inspect:

• Engine oil

• Air filter

• Spark plug

• Pump housing

• Mechanical seal

• Suction hoses

• Discharge hoses

• Couplers

• Manifold valves

• Tank

• Spray nozzles

• Tires

• Wheel bearings

• Brakes

• Lights

• Safety chains

• Hitch coupler

Drain and clean the system when storing it in freezing conditions.

Water left in pumps, hoses, or valves can freeze and damage components.

Pump Priming

Centrifugal pumps generally require proper priming before suction operation.

Running the pump dry can damage seals and reduce service life.

Before pumping:

1. Connect the suction hose.

2. Check all fittings.

3. Fill or prime the pump housing as instructed.

4. Position the suction end correctly.

5. Start the engine.

6. Monitor discharge.

Air leaks on the suction side can prevent the pump from priming correctly.

Common WT5C Problems

Pump Will Not Prime

Possible causes include:

• Air leak

• Loose suction fitting

• Empty pump housing

• Damaged hose

• Clogged suction inlet

• Excessive suction lift

Low Water Flow

Possible causes include:

• Clogged hose

• Restricted manifold

• Worn pump

• Low engine speed

• Damaged impeller

• Air entering the suction line

Spray Bar Has Weak Output

Inspect:

• Pump speed

• Tank level

• Manifold valve position

• Spray nozzles

• Supply lines

Trailer Pulls Poorly

Check:

• Tire pressure

• Load distribution

• Brake condition

• Hitch height

• Wheel bearings

• Suspension

• Tank fill level

Frequently Asked Questions About the Multiquip WT5C

What is the Multiquip WT5C?

The WT5C is a trailer-mounted mobile water system with a 525-gallon tank and a 2-inch centrifugal pump.

How many gallons does the WT5C hold?

The current WT5C tank capacity is approximately 525 gallons.

What engine does the WT5C use?

The standard WT5C uses a Honda GX120 gasoline engine.

What pump does it use?

It uses the Multiquip QP2H 2-inch centrifugal pump.

How many gallons per minute can the WT5C pump?

Published specifications list approximately 158 GPM maximum flow.

What is the maximum head?

The standard WT5C is listed at approximately 115 feet of maximum head.

What brakes does the WT5C have?

The WT5C uses hydraulic surge brakes.

What is the WTE5C?

The WTE5C is the related 525-gallon trailer model equipped with electric brakes.

Is the WT5C DOT approved?

Current listings describe the WT5C as using a DOT-approved dual-axle trailer.

Does the WT5C have a spray bar?

Yes. It includes a rear spray-bar system.

Can the WT5C be used for dust control?

Yes. Dust suppression is one of its primary construction applications.

Can it wash construction equipment?

Yes. Equipment washdown is one of the intended applications.

Can the WT5C be used for firefighting?

It is marketed for emergency firefighting support applications, though it should not be assumed to replace certified fire apparatus.

Can the WT5C carry drinking water?

It is not certified for potable water according to current product-related listings.

Can it pump saltwater?

Current documentation indicates the system is not designed for saltwater or certain chemicals.

How much does the WT5C weigh dry?

Published specifications list approximately 1,428 pounds dry.

How much does 525 gallons of water weigh?

Approximately 4,379 pounds, before accounting for the trailer, pump, accessories, and other equipment.

What size hitch does the WT5C use?

Current standard listings identify a 2 5/16-inch ball hitch.

What is the difference between the WT5C and WT5HP?

The WT5C provides higher flow, while the WT5HP is designed for higher-pressure applications.

Is the WT5C good for rental fleets?

Yes. Its versatility across dust control, construction, washing, agriculture, and emergency-support work makes it useful for rental fleets and contractors who need one mobile water system for multiple applications.