The present invention relates to a sealing cartridge for a hydroblasting tool and a hydroblasting tool. The sealing cartridge (13) for a hydroblasting tool (25), comprising a sealing body (30) comprising a first through hole (37), a first sealing body surface (30a) and a second sealing body surface (30b); a support (29) comprising a second through hole (38), a first support surface (29a) and a second support surface (29b); and a guide (32) comprising a first guide surface (32a) delimiting an opening (39) and a second guide surface (32b) disposed around the opening (39); wherein the first through hole (37), the second through hole (38) and the opening (39) are configured to be axially aligned; the first support surface (29a) is configured to connect with the first sealing body surface (30a); the second support surface (29b) is configured to connect with the second guide surface (32b); and the first guide surface (32a) is configured to connect with the second sealing body surface (30b).