Drain apparatus with liquid trap and liquid level indicator

In combination:

• liquid drain apparatus for draining liquid from a surface, said liquid drain apparatus including a conduit having an upper open end for receiving said liquid and a lower end, a bottom wall partially extending across said lower end and defining an opening at said lower end for discharging liquid from said conduit, a partition having an upper partition end extending upwardly from said bottom wall and cooperable with said conduit and said bottom wall to form an open topped trough within said conduit, and a baffle within said conduit having a baffle lower distal end located in said trough above said bottom wall, said conduit, said baffle and said partition operable to form a liquid seal to prevent gas from passing through said conduit when liquid in said trough is of sufficient depth to engage said baffle lower distal end;
• and
• a buoyant liquid level indicator device within said conduit having an upper indicator device end and a lower indicator device end, said lower indicator device end positioned in said trough, said buoyant liquid level indicator device operable to float and move upwardly within said conduit only when a liquid seal is formed by said liquid drain apparatus.