Flygt 3350 / 7121 Pump Repair Kit — Double Mechanical Seal Assembly (Cross-ref: 3531.905)

Direct-fit double mechanical seal assembly for Flygt 3350 and Flygt 7121 submersible pump applications (including 7121.985). This kit is supplied fully pre-assembled on a new stainless-steel flange to simplify installation, improve alignment, and reduce setup errors during pump rebuilds. Cross-reference / alternative part no.: 3531.905.

At a glance

• Configuration: Double seal (upper + lower)

• Seal faces: TC/TC – TC/TC (Tungsten Carbide vs Tungsten Carbide, both stages)

• Elastomers: Viton (FKM)

• Mounting: Pre-assembled on stainless-steel flange

• Includes: Complete O-ring kit

Why this kit:

• Drop-in assembly reduces install time and setup errors

• Hard TC/TC faces for excellent wear and heat resistance

• Viton elastomers handle higher temperature and aggressive chemistry

• Stainless flange for strength, corrosion resistance, and precise seal seating

Compatibility:

• Flygt 3350

• Flygt 7121 (e.g., 7121.985)

• Cross-reference: 3531.905 (seal assembly reference)

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