Multiquip Diaphragm Pumps

Affectionately known in the industry as a “MUD or SLUDGE” Pump, they are ideal for the slow seepage applications where a centrifugal pump would ordinarily lose its prime. The positive displacement design and performance is perfect for muddy water, sludge or any water with a high percentage of solids.

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Description

Diaphragm Water Pump

The Solution for Mud, Sludge, and Slurry

When thick muck, bentonite slurry, or semi-solid sludge shuts down standard pumps, the diaphragm water pump from Multiquip keeps moving material. Designed as a positive-displacement unit, it handles solids up to 1⅝ inches while maintaining suction even in slow-seepage conditions. Contractors across industries rely on this diaphragm water pump because it performs in environments where a centrifugal or traditional trash pump loses prime. Compact enough for pickup transport, yet rugged enough for daily use, it provides the durability crews demand.

How the Diaphragm System Works

Unlike a high-speed centrifugal unit, the diaphragm pump uses a rubber diaphragm that flexes back and forth within an oil-bathed gearbox. On the suction stroke, it draws in water and solids; on the pressure stroke, it pushes them out through a discharge valve. Because the pumping chamber stays full, the diaphragm water pump never loses prime, even when air pockets, silt, or slow seepage enter the hose. This reliability makes it the go-to choice for sites where a dirty water pump cannot keep up.

Features That Make a Difference

  • Passes debris, clumps, and organics that would shut down lighter pumps
  • Runs at low 1,750 RPM to reduce wear and extend component life
  • Operates briefly without water flow, preventing seal damage
  • Quick-clean design allows diaphragm inspection in minutes
  • Integrated wheel kits (on select models) turn units into mobile trash pump solutions

These features keep every diaphragm water pump productive on tough jobs while minimizing service downtime.

Built for Real Job-Site Conditions

Multiquip designs each model with sealed gears, protective roll cages, and wheel-kit mounting points. As a result, one operator can move the pump easily across riprap or down trenches without risking damage. Unlike many competing models, this diaphragm pump withstands demanding field conditions while maintaining consistent flow.

Ideal Applications

Because of its design, the diaphragm water pump excels in industries where sludge and seepage slow traditional units:

  • Utility and telecom trenches where centrifugal pumps constantly airlock
  • Concrete slurry removal where fine particles overwhelm impellers
  • Environmental cleanup in sediment ponds or cofferdams
  • Agricultural waste lagoons handling manure and runoff

Why Contractors Trust Multiquip

Multiquip powers each model with proven Honda engines featuring Oil-Alert shutdown for added protection. Oil-lubricated gears extend service life, while common parts across the family simplify maintenance for rental fleets. With nationwide dealer and service support, contractors stay productive and minimize downtime.

Keep Projects Moving

From municipal vaults to agricultural pits, the diaphragm water pump ensures sludge, slurry, and seepage don’t delay schedules. Durable, versatile, and efficient, it replaces unreliable centrifugal units with a powerful, debris-handling solution. Add a Multiquip diaphragm water pump to your fleet and stay ready for the messiest challenges—confident your crews can keep water moving no matter how dirty the job gets.

MQD2HA

2″ Diaphragm Pump, 50 GPM, MAX Head 25 ft., Honda GX120 Engine

MQ diaphragm pumps utilize a positive displacement design to effectively move high viscosity liquids, sludge, and general heavy debris laden fluids. Their simple reciprocating dynamics provide the force to successfully operate in the most demanding applications.

  • Ideal for muddy water, high solid content.
  • Handles 1 5/8” solids.
  • For fluids up to 180° F.
  • Pumps up to 50 gallons (189 liters) per minute.
  • Maximum lift of 25 feet (7.6 meters).
  • Powered by a Honda GX120 3.5HP gasoline engine.
  • Enclosed gears with oil bath lubrication.
  • Integrated Wheel Kit assembly for ease of transportation.
Unit Specifications
Suction x Discharge 2 x 2 in
51 x 51 mm
Max. Water Capacity 50 gpm 189 lpm
Max. Lift 25 ft 7.6 m
Max. Head 25 ft 7.6 m
Fuel Tank Capacity 2.1 qt 2 L
Optional Wheel Kit Wheel Kit included with Pump
Dimensions & Weights
Overall Length 27.0 in 686 mm
Overall Width 18.5 in 470 mm
Overall Height 20.5 in 521 mm
Operating Weight 125 lb 57 kg

MQD3HA

3″ Diaphragm Pump, 90 GPM, 25 ft MAX Head; Honda GX120

MQ diaphragm pumps utilize a positive displacement design to effectively move high viscosity liquids, sludge, and general heavy debris laden fluids. Their simple reciprocating dynamics provide the force to successfully operate in the most demanding applications.

  • Ideal for muddy water, high solid content.
  • Handles 1 5/8” solids.
  • For fluids up to 180° F.
  • Pumps up to 90 gallons (342 liters) per minute.
  • Maximum lift of 25 feet (7.6 meters).
  • Powered by a Honda GX120 3.5HP gasoline engine.
  • Enclosed gears with oil bath lubrication.
  • Integrated wheel kit assembly for ease of transportation.
Unit Specifications
Suction x Discharge 3 x 3 in
76 x 76 mm
Max. Water Capacity 90 gpm 322 lpm
Max. Lift 25 ft 7.6 m
Max. Head 25 ft 7.6 m
Fuel Tank Capacity 2.1 qt 2 L
Optional Wheel Kit Wheel Kit included with pump
Dimensions & Weights
Overall Length 29.0 in 737 mm
Overall Width 22.0 in 559 mm
Overall Height 23.0 in 584 mm
Operating Weight 175 lb 79 kg