Grundfos CR / LP / UTP — OEM Type B Bellows Component Seal

Bellows-type component mechanical seal for Grundfos multistage and end-suction builds. Two sizes available, each supplied in SiC/SiC faces with Viton® elastomers (SIC/SIC/VIT) for durability, temperature, and chemical resistance.

How to order: Select your size from the dropdown to view pricing and the exact product photo.

Sizes & Cross-References

12 mm (405347)— OEM Type B (BUBV)

• Build: 12 mm single-spring, full bellows component seal; 2-piece design (rotary + stationary seat) with O-ring; SiC/SiC/Viton.

• Fits: CRK 2, CRK 4 (Seal House has confirmed fitment to CRK4.)

• Alt. manufacturing numbers: 405096, 405347, 405347TC

16 mm (425762, 964092654) — OEM Type B (BUBE)

• Build: 16 mm single-spring, full bellows component seal; 2-piece design (rotary + stationary seat) with O-ring; SiC/SiC/Viton.

• Fits: CRN 8, CR 16 (Grundfos BUBE 16 mm bellows)

• Equivalent: VGMG-1304

• Confirmed applications by Seal House (examples): 2.5LP5 U-G-A-BUBE, UPT50-160 U-G-A BUBE D9726

• Primary mfg number: (Old: 425762 New: 964092654). Alt. manufacturing numbers: 425763, 425762, 425762TC

Why choose this seal

• Bellows component design for stable working length and smooth installation

• SiC/SiC faces + Viton® for wear, temperature, and chemical resistance

• OEM Type B form factor to match Grundfos assemblies

What’s included: Component mechanical seal (rotary + seat). (Ancillary gaskets/sleeves sold separately unless noted.)

Notes:
Please verify shaft size (12 mm or 16 mm), series/model (CR/CRK/CRN/LP/UTP), and OEM type code (BUBV/BUBE) against your nameplate or parts list. Need help confirming the right option? Contact us—we’ll match it to your pump and duty.

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