Valve, Chem-Vac, Glass Portion Only, 1-Arm, 0-4mm Bore, 13mm OD Barrel, 9mm X 1.5W Sidearm. CHEM-VAC valve glass portion only. Valve has a single sidearm sealed at a 90¿ angle to the barrel. Heavy duty rounded coarse thread and precision formed tapered seat. Dimensions as listed. PLEASE NOTE: THE 0-20mm BORE SIZE IS OUR PREVIOUS STYLE CG-500 SERIES VALVE WITH COARSE THREAD.