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The PARKER PT-00558 is a flareless bite-type tube union designed for connecting two tube ends in hydraulic, pneumatic, and fluid-handling systems without the need for flared tubing. It accommodates a 10 mm outside diameter tube and uses a compression-style bite action to create a secure, leak-resistant connection. This type of fitting is a standard choice in industrial and mechanical systems where tube flaring is impractical or where a reusable, reliable union connection is required. Installation is typically performed by pipefitters, hydraulic technicians, and mechanical contractors working on fluid or pneumatic circuits.
Flareless bite-type unions are used across a range of applications including hydraulic power units, pneumatic control lines, fluid transfer systems, and industrial machinery. The 10 mm tube OD sizing fits metric tubing commonly found in European-standard equipment and imported machinery. This union is suited for both new installation and maintenance replacement work where a clean, inline tube connection point is needed.
Designed as an OEM-style replacement or new-installation union fitting for metric hydraulic and pneumatic tubing systems using 10 mm outside diameter tubing.
Installation is performed by qualified pipefitters or hydraulic technicians. Before servicing any fluid or pneumatic line, depressurize the system fully and verify pressure has been bled off before loosening or connecting fittings. Ensure tube ends are cut cleanly and squarely with no burrs before seating the bite ring. Follow the fitting manufacturer's assembly procedure for the required number of turns to achieve proper bite-ring engagement.
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