(under the class definition) Dispensers having a fluid trap means to seal inlets or outlets.
(1) Note. The fluid traps, for the most part, are to prevent the vapors formed by volatile contents (such as gasoline) escaping through the dispensing and/or vent openings.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids
242, for chamber seals, and see the notes thereto.
137, Fluid Handling,
247+, for liquid valves and liquid trap seals. 210, Liquid Purification or Separation,
163+, for catch basins or traps having grated inlet surface drains.
217, Wooden Receptacles,
105, for valved barrel bungs with a liquid seal.
220, Receptacles,
228, for closures with a liquid seal.
406, Conveyors: Fluid Current, appropriate subclasses for hydraulic conveyors.
