With PTFE adjustable bore metering plug. Turning the adjustment knob allows flow rate to be controlled from full flow to drop wise. The metering plug completely solves the problems of sudden overflow or non-flow during addition of reagents.

With 1:5 Teflon® stopcock

With a 0-4mm vacuum valve and a glass stopcock with 2mm bore having constant pressure retention device. C-coarse, M-medium porosity. (For porosity grade see table in appendix).

With a 0-4mm vacuum valve and a glass stopcock with 2mm bore having constant pressure retention device. C-coarse, M-medium porosity. (For porosity grade see table in appendix).