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Factory Direct Chemical Pump Mechanical Seal Yb-Wb3-25mm PTFE Bellows Seal Customizable. PTFE Bellows Design: Provides pressure compensation and prevents radial runout for increased floatability. Customizable Materials: Rotating parts in Carbon/Sic/Tc; Metal parts in SS304/SS316L; Stationary in Sic/Tc/Car. Wide Application Scope: Suitable for acid-proof pumps, plastic pumps, alkali pumps, and vacuum equipment. OEM/ODM Services: Supports custom logos, designs, and tailored mechanical seal solutions. Balanced Structure: Single end, balanced design with independent rotation direction for stability.