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The PARKER PT-00777 is a flareless bite-type tube plug designed to seal 28 mm outside-diameter tubing without the need for flared tube ends. Bite-type fittings use a ferrule that bites into the tube wall when tightened, creating a secure, leak-resistant seal. This plug terminates a tube run or caps off an unused port in a hydraulic, pneumatic, or fluid-transfer line. It is installed by licensed or journeyman-level tradespeople working on industrial fluid systems, HVAC equipment, or commercial plumbing assemblies where flareless connections are specified.
This tube plug is suited for applications requiring a dead-end seal on 28 mm OD tubing in medium-pressure fluid lines. Typical install scenarios include capping spare ports on manifolds, sealing unused branch lines during system commissioning, or isolating sections of tubing for maintenance. The bite-type design eliminates the need for flaring tools, making it practical in tight-access installations.
Designed as an OEM-style replacement or service component for flareless bite-type tube fitting systems using 28 mm OD tubing.
Installation is typically performed by hydraulic, pneumatic, or plumbing technicians familiar with flareless compression-style fittings. Depressurize and isolate the fluid system completely before removing any existing fittings or installing this plug. Hand-tighten the plug to seat the ferrule, then apply the wrench turns specified by the fitting system manufacturer to complete the bite. Inspect the connection for leaks before returning the system to service.
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