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Limited Time: Free Freight on Orders $1,000+ — May 1–May 31 | Lower 48 States
Limited Time: Free Freight on Orders $1,000+ — May 1–May 31 | Lower 48 States

Water Pumps & Parts

UnitedBuilt offers a complete selection of water truck pumps and pump replacement parts, including our own line of 4x3 cast iron centrifugal pumps designed for demanding dust suppression and fluid transfer applications. Engineered for durability and performance, our pumps are manufactured in the USA using domestic and global high-quality materials and built to strict quality standards.

Our UnitedBuilt pumps are available in both mechanical seal (M3ZRMS) and rope packing seal (M3ZRM) configurations, providing flexibility based on your maintenance preferences and operating conditions. Each model is designed as a direct replacement for Berkeley B3ZRM and B3ZRMS water truck pumps, ensuring easy integration and reliable performance.

In addition to complete pumps, we stock a full range of pump repair parts and components, including impellers, mechanical seals, packing kits, shaft kits, volutes, and related hardware. Whether you’re rebuilding a pump or replacing a single component, these parts are selected for reliability and compatibility in real-world applications.

We also stock and distribute genuine OEM water truck pumps from Berkeley and Franklin Electric, along with supporting components to keep your system operating efficiently.

We work to keep our most in-demand pumps and parts readily available and offer fast shipping to help minimize downtime and keep your equipment running. Whether you need a complete pump or replacement parts, you’ll find dependable solutions built for the job.

Water Pumps & Parts - UnitedBuilt Equipment

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  • Water Pump, Cast Iron, 4x3, Counter-Clockwise (CCW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68416MS - UnitedBuilt Equipment
    Water Pump, Cast Iron, 4x3, Counter-Clockwise (CCW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68416MS - UnitedBuilt Equipment

    Water Truck Pump, Cast Iron, 4x3, Counter-Clockwise (CCW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68416MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $1,300.00
    $1,300.00 - $1,300.00
    $1,300.00

    The UnitedBuilt B68416MS Water Truck Pump is a high-quality, heavy-duty aftermarket replacement for the Berkeley B68416 (B3ZRMS), engineered for re...

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    $0.00 - $0.00
    $0.00
    $1,300.00
    $1,300.00 - $1,300.00
    $1,300.00
  • Water Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68417MS - UnitedBuilt Equipment
    Water Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68417MS - UnitedBuilt Equipment

    Water Truck Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Mechanical Seal, UnitedBuilt M3ZRMS B68417MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $1,300.00
    $1,300.00 - $1,300.00
    $1,300.00

    The UnitedBuilt B68417MS Water Truck Pump is a high-quality, heavy-duty aftermarket replacement for the Berkeley B68417 (B3ZRMS), engineered for re...

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    $0.00 - $0.00
    $0.00
    $1,300.00
    $1,300.00 - $1,300.00
    $1,300.00
  • Water Pump, Cast Iron, 4X3, Counter Clockwise (CCW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66895MS - UnitedBuilt Equipment
    Water Pump, Cast Iron, 4X3, Counter Clockwise (CCW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66895MS - UnitedBuilt Equipment

    Water Truck Pump, Cast Iron, 4X3, Counter Clockwise (CCW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66895MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $1,275.00
    $1,275.00 - $1,275.00
    $1,275.00

    The UnitedBuilt B66895MS Water Truck Pump is a heavy-duty, high-quality aftermarket replacement for the Berkeley B66895 (B3ZRM), engineered for rel...

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    $0.00 - $0.00
    $0.00
    $1,275.00
    $1,275.00 - $1,275.00
    $1,275.00
  • Volute Gasket, 4x3, UnitedBuilt M3Z S05126MS - UnitedBuilt Equipment
    81 in stock

    Volute Gasket, 4x3, UnitedBuilt M3Z S05126MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $11.50
    $11.50 - $11.50
    $11.50

    UnitedBuilt Volute Gasket 4 x 3 (M3Z) Not sure if it fits? Call us at 602-253-7739 or send us a message in our chat.  

    $0.00 - $0.00
    $0.00
    $11.50
    $11.50 - $11.50
    $11.50
  • Water Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66899MS - UnitedBuilt Equipment
    Water Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66899MS - UnitedBuilt Equipment

    Water Truck Pump, Cast Iron, 4x3, Clockwise (CW), Grooved Ends, Rope Packing Seal, UnitedBuilt M3ZRM B66899MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $1,275.00
    $1,275.00 - $1,275.00
    $1,275.00

    The UnitedBuilt B66899MS Water Truck Pump is a heavy-duty, high-quality aftermarket replacement for the Berkeley B66899 (B3ZRM), designed for relia...

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    $0.00 - $0.00
    $0.00
    $1,275.00
    $1,275.00 - $1,275.00
    $1,275.00
  • Rope Packing Set (6 Pieces), UnitedBuilt M3ZRM S14022MS - UnitedBuilt Equipment
    69 in stock

    Rope Packing Set (6 Pieces), 1/4" SQ Braided Graphite/PTFE, UnitedBuilt M3ZRM S14022MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $27.75
    $27.75 - $27.75
    $27.75

    Rope Packing Set (6 Pieces) S14022 for B3ZRM pumps.

    $0.00 - $0.00
    $0.00
    $27.75
    $27.75 - $27.75
    $27.75
  • Hydraulic Coupler 7/8" Spline 13 Tooth, (Key Sold Separately) UnitedBuilt S30636MS - UnitedBuilt Equipment
    100 in stock

    Hydraulic Coupler 7/8" Spline 13 Tooth x 1-1/8" Shaft 1/4" Key, (Key Sold Separately) UnitedBuilt S30636MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $270.00
    $270.00 - $270.00
    $270.00

    Hydraulic Coupler 7/8" Spline 13 Tooth, (Key Sold Separately) UnitedBuilt S30636MS

    $0.00 - $0.00
    $0.00
    $270.00
    $270.00 - $270.00
    $270.00
  • Packing Split Gland, Cast Iron, UnitedBuilt M3ZRM B82468MS - UnitedBuilt Equipment
    Packing Split Gland, Cast Iron, UnitedBuilt M3ZRM B82468MS - UnitedBuilt Equipment
    44 in stock

    Packing Split Gland, Cast Iron, 1-1/8" Shaft, UnitedBuilt M3ZRM B82468MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $60.00
    $60.00 - $60.00
    $60.00

    Split packing gland set made of cast iron for B3ZRM/M3ZRM pumps.

    $0.00 - $0.00
    $0.00
    $60.00
    $60.00 - $60.00
    $60.00
  • Seal Kit, Rope Packing, UnitedBuilt M3ZRM (Gasket, Slinger, Grease Cap, Rope Kit, Bolts, and Nuts) - UnitedBuilt Equipment
    Seal Kit, Rope Packing, UnitedBuilt M3ZRM (Gasket, Slinger, Grease Cap, Rope Kit, Bolts, and Nuts) - UnitedBuilt Equipment
    Save 5% Save %
    69 in stock

    Seal Kit, Rope Packing, UnitedBuilt M3ZRM (Gasket, Slinger, Grease Cap, Rope Kit, Bolts, and Nuts)

    UnitedBuilt
    $78.20
    $78.20 - $78.20
    $78.20
    $74.29
    $74.29 - $74.29
    $74.29

    Get all the essentials you need with the UnitedBuilt Pump Accessories Bundle. This bundle includes the Rope Packing Set (6 Pieces) S14022 for B3ZRM...

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    $78.20
    $78.20 - $78.20
    $78.20
    $74.29
    $74.29 - $74.29
    $74.29
    Save 5% Save %
  • Powerhead, Cast Iron, 4x3, Counter Clockwise (CCW), Rope Packing Seal, UnitedBuilt M3ZRM B85551MS - UnitedBuilt Equipment
    Powerhead, Cast Iron, 4x3, Counter Clockwise (CCW), Rope Packing Seal, UnitedBuilt M3ZRM B85551MS - UnitedBuilt Equipment
    24 in stock

    Powerhead, Cast Iron, 4x3, Counter Clockwise (CCW), Rope Packing Seal, UnitedBuilt M3ZRM B85551MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $925.00
    $925.00 - $925.00
    $925.00

    UnitedBuilt Powerhead M3ZRM 4X3 Rope Packing CCW Complete centrifugal water pump, less the volute. This powerhead bolts directly to your existing p...

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    $0.00 - $0.00
    $0.00
    $925.00
    $925.00 - $925.00
    $925.00
  • Seal Kit, Mechanical Seal, UnitedBuilt M3ZRMS (Gasket, Slinger, Grease Cap, and Mechanical Seal) - UnitedBuilt Equipment
    Seal Kit, Mechanical Seal, UnitedBuilt M3ZRMS (Gasket, Slinger, Grease Cap, and Mechanical Seal) - UnitedBuilt Equipment
    Save 5% Save %
    81 in stock

    Seal Kit, Mechanical Seal, UnitedBuilt M3ZRMS (Gasket, Slinger, Grease Cap, and Mechanical Seal)

    UnitedBuilt
    $101.72
    $101.72 - $101.72
    $101.72
    $96.63
    $96.63 - $96.63
    $96.63

    Upgrade and optimize your pump system with the ultimate bundle from UnitedBuilt. This comprehensive package includes a high-quality 1-1/8" Type C M...

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    $101.72
    $101.72 - $101.72
    $101.72
    $96.63
    $96.63 - $96.63
    $96.63
    Save 5% Save %
  • Slinger Water 1-3/32 ID, UnitedBuilt M3Z S12260MS - UnitedBuilt Equipment
    122 in stock

    Slinger Water 1-3/32 ID, UnitedBuilt M3Z S12260MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $3.00
    $3.00 - $3.00
    $3.00

    UnitedBuilt Water Slinger for B3Z & B4Z pumps. Not sure if it fits? Call us at 602-253-7739 or send us a message in our chat.  

    $0.00 - $0.00
    $0.00
    $3.00
    $3.00 - $3.00
    $3.00
  • Powerhead, Cast Iron, 4x3, Counter Clockwise (CCW), Mechanical Seal, UnitedBuilt M3ZRMS B85549MS - UnitedBuilt Equipment
    Powerhead, Cast Iron, 4x3, Counter Clockwise (CCW), Mechanical Seal, UnitedBuilt M3ZRMS B85549MS - UnitedBuilt Equipment
    10 in stock

    Powerhead, Cast Iron, 4x3, Counter Clockwise (CCW), Mechanical Seal, UnitedBuilt M3ZRMS B85549MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $950.00
    $950.00 - $950.00
    $950.00

    UnitedBuilt Powerhead M3ZRMS 4X3 Mechanical Seal CCW Complete centrifugal water pump, less the volute. This powerhead bolts directly to your existi...

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    $0.00 - $0.00
    $0.00
    $950.00
    $950.00 - $950.00
    $950.00
  • Bolt, Square Head, 3/8"-16 x 2-1/2", (2 Required for Packing Gland), UnitedBuilt M3ZRM S23762MS - UnitedBuilt Equipment
    388 in stock

    Bolt, Square Head, 3/8"-16 x 2-1/2", (2 Required for Packing Gland), UnitedBuilt M3ZRM S23762MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $6.68
    $6.68 - $6.68
    $6.68

    Bolt, Square Head, Zinc Plated 3/8-16 x 2-1/2" S23762

    $0.00 - $0.00
    $0.00
    $6.68
    $6.68 - $6.68
    $6.68
  • Water Truck Pump, Clockwise (CW), Rope Packing Seal, 4x3 Threaded FNPT, B3ZRM, 1-1/2" Shaft x 3/8" Key, ATP B86070 - UnitedBuilt Equipment
    Water Truck Pump, Clockwise (CW), Rope Packing Seal, 4x3 Threaded FNPT, B3ZRM, 1-1/2" Shaft x 3/8" Key, ATP B86070 - UnitedBuilt Equipment
    0 in stock. Available on backorder

    Water Truck Pump, Clockwise (CW), Rope Packing Seal, 4x3 Threaded FNPT, B3ZRM B3Z-HD , 1-1/2" Shaft x 3/8" Key, ATP B86070

    ATP
    $0.00 - $0.00
    $0.00
    $1,595.00
    $1,595.00 - $1,595.00
    $1,595.00

    The ATP B3Z-HD is a heavy-duty centrifugal water pump with a threaded suction and discharge side. Its 11⁄2″ shaft and keyed impeller make it strong...

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    $0.00 - $0.00
    $0.00
    $1,595.00
    $1,595.00 - $1,595.00
    $1,595.00
  • Impeller, Cast Iron, Counter Clockwise (CCW), UnitedBuilt M3Z M02181MS - UnitedBuilt Equipment
    Impeller, Cast Iron, Counter Clockwise (CCW), UnitedBuilt M3Z M02181MS - UnitedBuilt Equipment
    26 in stock

    Impeller, Cast Iron, Counter Clockwise (CCW), UnitedBuilt M3Z M02181MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $295.00
    $295.00 - $295.00
    $295.00

    UnitedBuilt threaded Counter-Clock Wise (CCW) cast iron impeller for M3Z pumps (or Berkeley B3Z) style pumps.

    $0.00 - $0.00
    $0.00
    $295.00
    $295.00 - $295.00
    $295.00
  • Mechanical Seal, Ceramic, 1-1/8" Type C (John Crane Type 21), UnitedBuilt M3ZRMS S32690MS - UnitedBuilt Equipment
    Mechanical Seal, Ceramic, 1-1/8" Type C (John Crane Type 21), UnitedBuilt M3ZRMS S32690MS - UnitedBuilt Equipment
    136 in stock

    Mechanical Seal, Ceramic, 1-1/8" Type C (John Crane Type 21), UnitedBuilt M3ZRMS S32690MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $67.63
    $67.63 - $67.63
    $67.63

    1-1/8″ Type C (John Crane Type 21) Short Mechanical Pump Seal for B3Z & B4Z model pumps. For B68416, B68417, B69876

    $0.00 - $0.00
    $0.00
    $67.63
    $67.63 - $67.63
    $67.63
  • Shaft Kit Rope Packing CCW UnitedBuilt B80696MS - UnitedBuilt Equipment
    Shaft Kit Rope Packing CCW UnitedBuilt B80696MS - UnitedBuilt Equipment
    30 in stock

    Shaft Kit, Rope Packing, B3ZRM CCW, Stressproof® Steel, 1-1/8" x 1/4" Key, UnitedBuilt B80696MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $265.00
    $265.00 - $265.00
    $265.00

    UnitedBuilt B80696MS Shaft Kit for M3ZRM CCW rope packing pump. Manufactured in the USA of original Niagara LaSalle’s patented Stressproof® steel a...

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    $0.00 - $0.00
    $0.00
    $265.00
    $265.00 - $265.00
    $265.00
  • Shaft Kit, Mechanical Seal, CCW, UnitedBuilt B80697MS - UnitedBuilt Equipment
    Shaft Kit, Mechanical Seal, CCW, UnitedBuilt B80697MS - UnitedBuilt Equipment
    30 in stock

    Shaft Kit, Mechanical Seal, CCW, UnitedBuilt B80697MS

    UnitedBuilt
    $268.30 - $268.30
    $268.30
    $268.30
    $268.30 - $268.30
    $268.30

    UnitedBuilt B80697MS Shaft Kit for M3ZRMS CCW mechanical seal pump. Manufactured in the USA of high-quality materials with precision machining. Di...

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    $268.30 - $268.30
    $268.30
    $268.30
    $268.30 - $268.30
    $268.30
  • Hex Nut, Brass, 3/8-16, (2 Required for Packing Gland), UnitedBuilt M3ZRM S23343MS - UnitedBuilt Equipment
    Hex Nut, Brass, 3/8-16, (2 Required for Packing Gland), UnitedBuilt M3ZRM S23343MS - UnitedBuilt Equipment
    532 in stock

    Hex Nut, Brass, 3/8-16, (2 Required for Packing Gland), UnitedBuilt M3ZRM S23343MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $1.50
    $1.50 - $1.50
    $1.50

    Hex Nut, Brass, 3/8-16 S23343

    $0.00 - $0.00
    $0.00
    $1.50
    $1.50 - $1.50
    $1.50
  • Grease Cap, UnitedBuilt M3ZRM(S) S19033MS - UnitedBuilt Equipment
    Grease Cap, UnitedBuilt M3ZRM(S) S19033MS - UnitedBuilt Equipment
    229 in stock

    Grease Cap, UnitedBuilt M3ZRM(S) S19033MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $20.00
    $20.00 - $20.00
    $20.00

    UnitedBuilt Inner Bearing Cap for B3Z & B4Z pumps. Keeps grease on your bearings and dirt and debris out. When rebuilding a pump, check that th...

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    $0.00 - $0.00
    $0.00
    $20.00
    $20.00 - $20.00
    $20.00
  • Retaining Ring, External, Stainless Steel, 1-1/8" Shaft, UnitedBuilt S23009MS - UnitedBuilt Equipment
    41 in stock

    Retaining Ring, External, Stainless Steel, 1-1/8" Shaft, UnitedBuilt S23009MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $3.30
    $3.30 - $3.30
    $3.30

    Retaining Ring, External, Stainless Steel 1-1/8" Shaft, Rotor Clip SH-112SS External Rings fit into the groove of a shaft. The portion of the ring ...

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    $0.00 - $0.00
    $0.00
    $3.30
    $3.30 - $3.30
    $3.30
  • Powerhead, Cast Iron, 4x3, Clockwise (CW), Rope Packing Seal, UnitedBuilt M3ZRM B85552MS - UnitedBuilt Equipment
    Powerhead, Cast Iron, 4x3, Clockwise (CW), Rope Packing Seal, UnitedBuilt M3ZRM B85552MS - UnitedBuilt Equipment
    6 in stock

    Powerhead, Cast Iron, 4x3, Clockwise (CW), Rope Packing Seal, UnitedBuilt M3ZRM B85552MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $925.00
    $925.00 - $925.00
    $925.00

    UnitedBuilt Powerhead M3ZRM 4X3 Rope Packing CW Complete centrifugal water pump, less the volute. This powerhead bolts directly to your existing pu...

    View full details
    $0.00 - $0.00
    $0.00
    $925.00
    $925.00 - $925.00
    $925.00
  • Powerhead, Cast Iron, 4x3, Clockwise (CW), Mechanical Seal, UnitedBuilt M3ZRMS B85550MS - UnitedBuilt Equipment
    Powerhead, Cast Iron, 4x3, Clockwise (CW), Mechanical Seal, UnitedBuilt M3ZRMS B85550MS - UnitedBuilt Equipment
    12 in stock

    Powerhead, Cast Iron, 4x3, Clockwise (CW), Mechanical Seal, UnitedBuilt M3ZRMS B85550MS

    UnitedBuilt
    $0.00 - $0.00
    $0.00
    $950.00
    $950.00 - $950.00
    $950.00

    UnitedBuilt Powerhead M3ZRMS 4X3 Mechanical Seal CW Complete centrifugal water pump, less the volute. This powerhead bolts directly to your existin...

    View full details
    $0.00 - $0.00
    $0.00
    $950.00
    $950.00 - $950.00
    $950.00