
If you have questions about the conjugation of заполнитель or Russian nouns in general, you can practice and get feedback from a professional tutor.
Ты, возьми заполнитель, замажь дырки и приберись.
You, get some filler, fill these holes in a-and clear this mess up.
Я говорила с одним из "заполнителей", который был там в ту ночь.
I spoke with one of the seat-fillers That was there that night.