Tamiya 74554 Air Compressor Anti-Vibration Mat
This mat is made from synthetic rubber (EPDM), and not only absorbs your air compressor's vibration, but it also still has the firmness to provide a stable base and ensure the compressor doesn't fall over.
This mat is of ample size to accommodate any of the air compressors sold by Tamiya and most other makers.
Dimensions: 155mm x 225mm x 10mm