CHEM-VAC™ valve with two sidearms sealed to the barrel at a 90º angle to one another. Valve has a TFE plug with three o-rings, the tip o-ring making the primary seal on the precision formed tapered seat. O-rings on the non-rotating shaft form an excellent dynamic seal between the TFE plug and glass barrel. Available with a choice of Viton, Ethylene Propylene (E.P.) or Kalrez® o-rings. See CG-935 for replacement plug, CG-537 for o-ring replacement kit, and CG-903 for glass portion only. PLEASE NOTE: THE 0-20mm BORE SIZE VALVE IS OUR PREVIOUS STYLE CG-500 SERIES VALVE WITH COARSE THREAD.