This 2.4L PYREX® desiccators has a rugged 24/29 Standard Taper external sleeves with tooled hose connections that serve as the stopcock. It is designed so that its manipulation is not affected by the vacuum. The open position is indicated by the molded arrow on the cap. A quarter turn from this position closes the desiccator. For ease in use and improved performance, it is recommended that the Standard Taper sleeve be lubricated with a silicone-based vacuum grease. The tubulation O.D. is approximately 10mm. Approximate bowl volume capacity is 2400mL. For replacement bowl, see No. 3081-150LO; for cover, see No.3121-150CO; for replacement stopcock see 3121-STPK. Warning: Do not heat or subject to pressure. Rated 1- atmosphere vacuum.