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Как перевести filling parts в следующем контексте:

The chamber is filled with water by a low pressure circuit, which is independent of the high pressure circuit. The chamber is fitted through two parts on either side. The water enters through one of these, and the air is expelled through the other as the chamber is filled. Therefore, the plugs must be only partially inserted during filling, so that these openings are left uncovered. The water pipes, in turn, are connected to the filling parts on the chamber.