Based on the image provided, this is a Major Maintenance/Repair Kit for a rotary vane vacuum pump, specifically intended for the Edwards E2M28 or E2M30 models.
Product Details

• Product Name: Edwards E2M28 / E2M30 Major Maintenance Kit
• Manufacturer: Typically manufactured by Edwards Vacuum or available through third-party specialized suppliers like Global Vacuum Products or A&J Vacuum Services. 

Description :
This kit is designed for a complete overhaul of a dual-stage, oil-sealed rotary vane vacuum pump. It contains all the necessary consumable parts required to restore the pump's performance and prevent leaks during a major service.

Key components typically included:

• Vanes: High-performance internal moving parts that create the vacuum.
• Seals & O-Rings: Various sizes (black circular rings) to ensure airtight connections.
• Gaskets: Large flat components used to seal pump housing sections.
• Springs & Pins: Internal mechanical components for the vane assemblies.
• Bearings: Often included in major kits to replace worn rotating elements.
• Filters & Exhaust Valves: To maintain proper oil and air flow.