R-3 Rolairtrol Air Separator 112068 3" NPT with Strainer. Rolairtrol Air Separator is used with Hot and Chilled Water Systems. The Bell & Gossett Rolairtrol is a patented air separator with significant advantages. The Rolairtrol is capable of removing the air that commonly causes problems in commercial hot and chilled water systems. The Rolairtrol provides air free flow, improving efficiency and performance of the HVAC system.Replaces 112068 Bell & Gossett 5360-03N-12-001