Evaporative cooler liners

Claim 1

An article forming a liner for the sump of an evaporative cooler comprising: at least a pair of preformed parts, all parts being formed of a resilient plastic material, each part comprising a flat base and side members extending laterally thereof in the same direction around a first portion of said base, a second portion of said base and the free ends of said side members forming mating edges of said parts which when engaged in an interlocking manner form a flat configuration, the mating edges of said parts having a tongue and groove configuration for interconnecting said parts in a water tight arrangement to form a water holding tray, said parts each comprise a U-shaped trough the open ends of which terminate in a common plane, the connected parts forming a tray having a central opening surrounded by a peripheral inner wall, a peripheral outer wall spaced from and parallel to said inner wall, and a peripheral water holding trough between said inner and outer walls.