0-4mm Chem-Vac Valve, Three Way, Glass Portion Only, 13mm OD Barrel, 9.0mm OD x 1.5 W Sidearms. CHEM-VAC valve glass portion only. Three-way configuration for use in construction of manifolds, adapters, etc. Valve has two barrels sealed together 180 from one another, each having a sidearm of the listed size and a common arm sealed between the barrels. Heavy duty rounded coarse thread and precision formed tapered seat.