The water jet feeder consists of a pressure-resistant body (1) with jaws (10), an inner chamber (7) and a perforated plate with a seal (20) covering its outlet channel (12). The seal holder is detachable from the body and has guides that are aligned with marks on the body for accurate positioning of the seal holder after removal. The guides are designed to allow the seal holder to slide parallel to the axis of the body, but also to move perpendicular to the perforated plate, and are in the form of ribs on one end of the seal holder engaging with grooves on the feeder body. The seal holder has a U-shaped cross-section with the branches of the U facing the inner chamber and engaging with grooves (24) in the body.
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