O-ring, 40 x 5mm – Viton, Part# 900068 – vacstellar

This O-ring is a direct replacement. It fits right into the groove. No cutting or gluing is needed. Just place it in position and assemble the parts .An O-ring creates a seal by being compressed. When you tighten the parts together, the O-ring gets squeezed in its groove. It fills up all the tiny gaps between the metal surfaces. The pressure inside the pump actually helps push the O-ring against the walls, making the seal even stronger.  this Viton O-ring (Part #900068). Measuring 40 mm by 5 mm, this O-ring creates a dependable seal between pump parts . Made from Viton, a high-performance material that resists heat, oil, and chemicals. Fits a wide range of Ebara and Pfeiffer pump models including UERR, A Series, UNO, and DUO families