Glass, clear, plastic coated.

• Clear plastic coated to protect against mechanical breakage
• Reduces the hazard of flying glass and liquid splashes in the event of breakage
• Implosion protection

Complete set includes 500 ml bottle with 3 necks (center neck GL 25, side necks GL 18), suction tube with safety valve, analog pressure gauge. Air-suction tube icnludes PTFE needle valve stopcock.