Flask is designed for vacuum distillations. Threaded sidearm has an open top nylon cap. Cap can be coupled with an o-ring to accommodate a thermometer or a gas inlet tube. A penetrable liner may be used to sample a reaction mixture using a syringe. Supplied complete with one size 010 Viton® o-ring and one PTFE-faced silicone liner. Flask has ST 14/20 joint and 13-425 bevel seal size.