These heavy wall bottles are unique in that Ace- Threds allow for easy closing of plugs, which are reusable. The plugs have O-rings for assurance of a tight seal by simply hand tightening. The bottles are offered in several lengths with #7, #15, #25, or #36 Ace-Threds. They can be custom fabricated in various lengths and diameters, if needed.For pressure work, a “Front Seal” plug (5846) is recommended. “Back Seal” plugs (8545) are also available, if preferred. Bottles have a pressure rating of 60psig at room temperature.Complete items include Glass Bottle and PTFE Plug with FETFE® O-Ring. Replacement O-rings and O-rings of different compositions are available. Also available, as an option, for monitoring purposes, the bottles can be assembled with a stainless steel, 0-160psig pressure gauge using a 5844 Adapter in place of the 5845 or 5846 Plugs. Stainless steel extensions are offered to allow use of the tube in a furnace.