oil tops

[Oleg18]

Подскажите,пожалуйста,как перевести Oil tops в следующем контексте

The following observations were noted when investigating our current
inventory of oil tops , based on your description of the quality concerns
has made:
Chipped ends I was unable to identify any issue concerning chipping on the
ends/edges of the tops. However, there was one top (the first top of a
skid) that did have an indent, most likely related to a stacking issue from
our supplier.

[lisulya]

крышки для контейнеров (канистр?)