O-ring, Buna – Part # 486537258 – vacstellar

An O-ring might seem like a simple rubber ring, but it plays a very important role in your vacuum pump. The VacStellar O-ring, Buna (Part # 486537258) is a replacement part. It is made to fit perfectly and work reliably.

This O-ring is made from Buna rubber. It is also known as Nitrile or Buna-N. It is one of the most trusted and popular materials for vacuum pump seals. It measures 337 mm across and is 5 mm thick, making it a direct fit for the Busch COBRA NC0630B vacuum pump. This O-ring is a key part of the official Busch COBRA NC0630B Gasket Kit (Part # 990543930). That gasket kit is a complete set of seals for rebuilding your pump. So, you can be confident this part is exactly what your pump needs.