Spacer ring, Steel, 35 x 29 x 1 mm, Leybold, Trivac, Part# 440023 – vacstellar

This is the Leybold part for this task. Use part number 440023 (also known as L0021) for a direct replacement.

It is designed for Trivac D8B, D16B, D25B, D40B, and D65B pumps and their S-Series equivalents (S8B, S16B, S25B, S40B, S65B). Its dimensions are precise: 35 mm outer diameter, 29 mm inner diameter, and 1 mm thick. 

It ensures proper alignment. It can prevent parts from rubbing together. It allows other components to fit and function correctly. Even a tiny difference can affect how the whole pump works.

This spacer is built from steel. Steel is strong and won’t compress easily. This means the gap it creates stays accurate over time, even with vibration.