Flexible Bellow Sealing

Water Pump Seals

Universal Elastomer Bellow Pump Protection

Water pump seals must balance dynamic flexing, self-lubrication, and robust scaling resistance. By utilising friction-fit elastomer bellows that grip the pump shaft directly, these seals transmit torque without set-screws or driving pins. This eliminates shaft scoring while absorbing radial alignment variances and axial runout common in domestic, agricultural, and industrial pumping networks.

Micro Engineering manufactures a broad portfolio of replacement water pump seals, direct-matched to standard OEM configurations including the MG Series, Robin Type Seals, and JC Series. All seal bodies are pressure-tested and equipped with custom-matched seats to ensure zero leak rates on hot and cold utility boundaries.

Product range

Select a category series below to filter our catalog range.

MG1 Bellow Seal
⚡ Rubber Bellow
MG Series

MG1 Bellow Seal

The MG1 elastomer bellow mechanical seal is a highly versatile, mass-produced dynamic seal popular for domestic and industrial water pumps.

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MGS20 Bellow Seal
⚡ Friction Fit Drive
MG Series

MGS20 Bellow Seal

The MGS20 bellow seal is engineered for dynamic pump shafts, utilizing rubber friction transmission to eliminate dynamic wear on shaft sleeves.

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MG12 Bellow Seal
⚡ Heavy Rubber Collar
MG Series

MG12 Bellow Seal

The MG12 is characterized by its heavy rubber drive collar that transmits rotational forces evenly, minimizing face runout.

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MG13 Bellow Seal
⚡ High Speed Bellow
MG Series

MG13 Bellow Seal

The MG13 seal is designed to withstand elevated shaft speeds up to 15 m/s, offering superior pressure-temperature margins in general services.

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Single Robin Type Seal
⚡ Rigid SS Design
Robin Type Seals

Single Robin Type Seal

The Robin Type single seal uses high-strength stainless steel components to handle demanding industrial sewage and water pumping loops.

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Double Robin Type Seal
⚡ Dual Containment
Robin Type Seals

Double Robin Type Seal

The Double Robin arrangement delivers dual fluid film containment boundaries, preventing dynamic seal dry-running in dry sumps and vacuum vessels.

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JC Type 2 Seal
⚡ John Crane Style
JC Series

JC Type 2 Seal

Designed to replicate the robust John Crane Type 2, this elastomer bellows seal is suitable for high-vibration rotating machinery and water services.

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JC Type 2100 Seal
⚡ Compact Footprint
JC Series

JC Type 2100 Seal

The JC Type 2100 is a compact, unitized elastomer bellows seal designed to fit directly in standard short-cavity stuffing boxes without modification.

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JC Type 502 Seal
⚡ High Pressure Grade
JC Series

JC Type 502 Seal

Featuring a balanced profile, the JC Type 502 Bellow Seal handles elevated operational pressure up to 40 bar without dynamic extrusion or damage.

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JC Type 21 Seal
⚡ Pool & Bilge Special
JC Series

JC Type 21 Seal

The JC Type 21 general-purpose seal is a long-standing industrial standard for swimming pool pumps, domestic supply, and light compressors.

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G01 Type Seal
⚡ Grundfos G01
Grundfos Series

G01 Type Seal

The G01 mechanical seal is designed for Grundfos washdown and circulation pump units, featuring a robust shaft-driven O-ring design.

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G02 Type Seal
⚡ Grundfos G02
Grundfos Series

G02 Type Seal

The G02 dynamic bellow seal provides a reliable friction-fit seal on Grundfos multistage centrifugal shafts, reducing wear and operational noise.

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G03 Type Seal
⚡ Grundfos G03
Grundfos Series

G03 Type Seal

Designed to ease maintenance, the G03 cartridge seal slide-fits directly on Grundfos CR pump shafts, offering quick, error-free field assembly.

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G04 Type Seal
⚡ Grundfos G04
Grundfos Series

G04 Type Seal

The G04 balanced seal manages high-pressure surges up to 25 bar. Designed specifically for vertical high-head pumps.

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G05 Type Seal
⚡ Grundfos G05
Grundfos Series

G05 Type Seal

The G05 rubber bellows seal provides a highly cost-effective and flexible replacement option for light-duty domestic Grundfos circulation lines.

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CNP Pump Seal 16mm
⚡ CNP 16mm
CNP Pump Seal

CNP Pump Seal 16mm

Precision engineered 16mm shaft diameter mechanical seal specifically optimized for CNP vertical multistage centrifugal pumps.

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CNP Pump Seal 20mm
⚡ CNP 20mm
CNP Pump Seal

CNP Pump Seal 20mm

Heavy-duty 20mm shaft mechanical seal built to match CNP high-flow horizontal and vertical multistage pumps.

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Features & Benefits

Excellent sealing performance parameters inside generic water networks.

Clogging Prevention

Dynamic elastomer bellows continuously flex and stretch, flinging off suspended particulates to prevent spring hangup in sewage setups.

Zero Shaft scoring

The rubber bellows features a static fit on the sleeve. Dynamic sliding remains confined between the faces, preventing shaft scoring.

Material Adaptability

Available in NBR, EPDM, Viton, or FFKM elastomers paired with Ceramic, Silicon Carbide, or Tungsten Carbide stationary faces.

DIN 24960 Fitting

Machined to standardized sizes ranging from 10mm to 100mm, ensuring direct interchangeability with standard global pump housings.

Performance Boundaries & Setup

Comparing Elastomer Bellow Seals vs. Metal Bellow Seals.

Parameters Elastomer Bellow Seals (MG/JC/Robin) Metal Bellow Seals
Temperature Limits -40°C to +180°C (elastomer limited). -50°C to +400°C (all-metal high-temperature design).
Slurry Grit & Solids Excellent (thick rubber bellows sweep away abrasive scale). Moderate (suspended grit can collect in weld convolutions).
Torque Transmission Friction-fit dynamic bellows (no set-screws needed). Metal weld joints and drive pins.
Shaft Scoring Risk None (bellows remains statically clamped). None (no relative sliding on shaft sleeves).
Initial Investment Highly economical (ideal for mass-production). High capital investment (precision welded plates).

Why Choose Our Water Pump Seals?

Micro Engineering supplies DIN 24960 standard bellows seals, ensuring zero shaft wear and reliable sealing inside hot & cold water pump housings.

Vulcanized Rubber Bellows

All bellows are molded from certified high-tensile Nitrile (NBR), EPDM, or Viton (FKM) to resist ozone and thermal cracking.

Helium Lapped Flatness

Sealing surfaces are lapped down to 1-2 light bands to ensure zero static fluid escape upon pump startup.

Universal Seat Matching

Easily paired with custom stationary seats (Ceramic, Silicon Carbide, or Tungsten Carbide) depending on particulate grit level.

DIN 24960 Standard Fit

Manufactured to strict international standard fits, guaranteeing drop-in alignment with direct OEM parts.

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