Flygt 3350 / 7121 Seal Kit — Double Mechanical Seal Assembly

Direct-fit double mechanical seal set for Flygt 3350 and 7121 pumps (incl. 7121.985). Supplied fully assembled on a new stainless-steel flange to simplify installs and ensure proper alignment—O-ring kit included.

At a glance:

• Configuration: Double seal (upper + lower)

• 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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