Foremost Model 20/21 Vacuum Receiver/ Chamber ronnieevans 4 years ago Foremost Vacuum Chamber Foremost Model 20/21 Vacuum Receiver/ Chamber – Volume – approximately 2 cubic feet – Diameter- 24” – Length- 32” – In-let- 2”, 2.5″ and 3″ – Out-let 2”. 2.5″ and 3″ – Condition- Excellent – 6 available