Gutter drain apparatus

Gutter drain apparatus for emplacement in concrete decking for draining liquids from the surface thereof, said gutter being subject to inward pressure upon expansion of said concrete decking, said gutter drain apparatus comprising:

• a drainage trough adapted to be installed below grade in said decking and having an open top, said trough having side walls, and first retaining means including a lip portion on said side walls;
• a cap member for covering said open top of said trough, said cap member having second retaining means including a hook portion for cooperation with said lip portion of said first retaining means for detachably latching said cap member on said trough,
• protection means for forming a spacing for protecting said first and second retaining means from the effects of said inward pressure to maintain said cap member on said trough without diminishing the removability of said cap member notwithstanding said inward pressure;
• and
• wherein said protection means comprises a U-shaped groove formed at the top of each of said side walls, said U-shaped groove being bounded by a first wall section contiguous to said open top, a second wall section spaced outwardly from said first wall section and an interconnecting section extending between the first and second wall sections, and wherein said first retaining means is situated on the outward side of said first wall section.