The Cryomec Seal ring, identified by the article number 1504103 and the reference BE 4936, is a critical sealing ring. It is precisely manufactured for use in the cryopump type ZP 170-4-DC-CB-LABS-LC. This seal ensures the integrity and functionality of the pump, particularly in cryogenic environments where extreme cold prevails. The ring is made from materials optimized for low temperatures and resistance to cryogenic media. Its design ensures leak-tightness and durability even under the most demanding operating conditions. Its position in the pump assembly (Pos. 1) underscores its importance for sealing. This seal is essential for maintaining the performance and safety of cryogenic applications, as commonly found in the liquefied gas industry and related fields. For the maintenance and servicing of your ZP 170-4-DC-CB-LABS-LC pump, this original part is the right choice. Immediately available to ensure operational continuity.