The Fittings | KF40 to KF16 Reducer is a stainless steel vacuum flange reducer that adapts KF40 connections to KF16 fittings, enabling flexible vacuum line configurations in distillation and extraction systems. This centering-ring style reducer maintains full vacuum integrity while connecting components of different flange sizes, such as vacuum pumps, cold traps, and vacuum gauges. Compatible with all standard KF40 and KF16 components across Leybold, Agilent, VTA, and UIC systems. Sold individually.