CF 6.75″ to CF 2.75″ zero-length reducer

1 × CF 2.75″ (DN40CF), 1 × CF 6.75″ ConFlat flanges, 40.2 cm³ of internal volume and 164.8 cm² of wetted surface.

Its internal volume and surface area feed the pumpdown simulation, and its 3D characterization sets how it affects pumping speed.

Specifications

Type	To CF 2.75″ zero-length reducer
Flanges	1 × CF 2.75″ (DN40CF), 1 × CF 6.75″ ConFlat (CF), knife-edge, copper gasket
Ports	2
Internal gas volume	40.2 cm³ (0.04 L)
Wetted surface area	164.8 cm²
Material	Stainless 304
Overall size	171 × 171 × 21 mm
Outgassing (unbaked, 1 h)	6.0e-9 Torr·L/s/cm²
Simulation-ready	Yes, characterized from its 3D geometry

Volume and surface area are computed from the CAD model's enclosed gas space. Material outgassing values are typical published figures.