Flygt Plug-In 45mm Seal Kit — Double Cartridge Mechanical Seal (Pre-Assembled)

Replacement Flygt Plug-In 45mm double cartridge mechanical seal for Flygt submersible pumps that use a 45mm shaft. This plug-in, pre-assembled double seal cartridge simplifies installation during service/rebuilds and helps deliver consistent sealing performance by keeping the motor-side and liquid-side seals aligned in one unit.

Housing spring note: The “long spring” is a housing retention spring used to help hold the plug-in components / pump housing together. It is not part of the mechanical seal cartridge. This spring is included in the factory/OEM O-ring kit.

Compatibility (45 mm shaft)

• Flygt pumps: 3171, 4650, 4660, 5100.250, 5100.251, 5100.260, 5100.261

• Cross-reference / part no.: (varies by build—contact us to confirm)

Available versions & What’s Included:

Cartridge mechanical seal only
Includes the pre-assembled double mechanical seal cartridge (motor-side and liquid-side seals in one unit).

Cartridge mechanical seal + O-ring kit
Includes the cartridge mechanical seal + OEM O-ring kit. Recommended for a full rebuild.

Cartridge mechanical seal + O-ring kit + Long spring (bearing housing / volute)
Includes the cartridge mechanical seal + OEM O-ring kit with the long spring for bearing housing / volute (contained in the OEM O-ring kit).

Important fitment note: Flygt plug-in seal assemblies can vary by build. Please enter your full pump model number at checkout under “Pump Model Number Notes” so we can confirm the correct configuration for your unit.

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Looking for more? Shop  Shaft seals, Parts & Accessories, and Pre-Cut Gaskets.

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