Pfeiffer DUO11MC – Vac Stellar

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O-ring, 10.3 x 2.4 mm – Viton, Part# 79569 – vacstellar $6.56

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O-ring, 122 x 2.5 mm – Viton, Part# 320481 – vacstellar $12.56

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O-ring, 16 x 1.5 mm – Viton, Part# 320473 – vacstellar $4.24

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O-ring, 22 x 1.5 mm – Viton, Part# PL23970016 – vacstellar $6.22

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O-ring, 27×2.5mm – Viton, Part# 4070465 – vacstellar $5.52

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O-ring, 42 x 2.5 – Viton, Part# 320485 $4.83
This is the Pfeiffer Part# 320485, a 42 mm x 2.5 mm O-ring made from high-quality Viton rubber . It is a replacement seal used on many Pfeiffer DUO series vacuum pumps including DUO1.6, DUO3, DUO6, and DUO11 models . This part is commonly found in major overhaul kits, seal kits, and maintenance kits .

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O-ring, 5 x 1.5 mm – Viton, Part# 4070065 – vacstellar $4.24

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O-Ring,Viton,65 X 5 MM Part# PL23970129 $8.33
This Viton O-ring (Part# PL23970129) measures 65 mm inside diameter with a 5 mm cross-section. Made from Viton (FKM) , it offers excellent resistance to high heat, chemicals, oils, and fuels. It is commonly used in repair kits for Busch, Leybold, and Pfeiffer vacuum pumps and is ideal for creating tight, reliable seals in harsh environments .

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