De'Longhi Fully Automatic Espresso Machine Repair O-Ring Set of 3, 44mm This is a set of 3 O-rings for repairing De'Longhi fully automatic espresso machines. Approximately 1.0g of food-grade grease is included. (The grease is placed in a food-safe zip-lock bag within the cylinder shown in the photo. The cylinder is not included. → Approximately 1.0g is sufficient for one replacement - application to the O-ring & sliding contact areas. Applying too much grease can promote the adhesion and residue of coffee grounds, leading to malfunctions and adverse effects.) * O-ring set of 3 + approximately 1.0g of grease. * Outer diameter is 44mm (Genuine is 45mm) * Ring thickness (width) is 4.1mm. Although the outer diameter of the ring is slightly smaller at 44mm compared to the genuine 45mm... There is absolutely no problem with installation or coffee extraction. The 44mm size allows for smoother movement of the moving parts even with long-term use, and is more likely to prevent malfunctions. We also offer the 45mm type, which is the same size as the genuine part. Please choose according to your needs. 45mm: Recommended for those who want the same size as the genuine part and can perform regular maintenance and replacements. 44mm: Recommended for those who tend to neglect maintenance. Both sizes will not affect coffee extraction.