The underside drain outlet of Univessel® Glass is flawlessly fitted to perfusion processes. This Unique designed glass vessel help any external recirculation principle to effortless put in a TFF set-up. The vessel is out there as 2 L, 5 L and ten L Variation. The descriptions and pics on this https://forum.ressourcerie.fr/index.php?qa=user&qa_1=b3qsghg986