Peptide Synthesis Vessel With Lower Joint, Hose Connection And T-Bore PTFE Stopcock provided by STE-Mart comes with a fritted disc of coarse or medium porosity to support resin. There is a GL thread and a PTFE-lined nylon screw cap at the top of the vessel. The Peptide Synthesis Vessel also features a PTFE stopcock equipped with an 8mm O.D. sidearm for inert gas introduction. The 8mm hose connection is used for vacuum applications. The 24/40 inner drip joint is used for connection with other standard glassware.