Zero Dead Space Drain Valve, 2" Beaded Pipe, Standard, 1" Beaded Pipe Sidearm, Torque Knob, GL-40 Thread. The Zero Dead Space flush bottom valve is designed to prevent solids from collecting in the bottom of the vessel. The PTFE drain valve plunger is supplied with a Perfluoro and a TFE encapsulated o-ring for the tip and two Perfluoro o-rings installed on the shaft. The drain valve is connected to the reactor by a unique 2 beaded pipe valve seat that is sealed to the reactor bottom. Chemglass's valve permits total drainage of the vessel contents. The sidearm has a 1 beaded pipe fitting. The plug assemby has a stabilizing pin that is used with the 100L agitators. The pin extends into the lower agitator and virtually eliminates any whipping by stabilizing the stirrer shaft. NOTE: COUPLINGS, HOSE CONNECTIONS AND ADAPTERS ARE SOLD SEPARATELY.