** As with any glass, the OH extraction chambers have some variance. On the regular retail version, the screens sit snug or have a little movement - but units are being sold as factory seconds because the screen sits especially loose, and may let some material through if you aren't careful. ***
This is the same glass extraction chamber that ships with the Freight Train starter kits.
For 14mm labware.
Replacement 21mm stainless steel screens are available separately.