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The PRO-SOURCE 2557004565PRO is a push-to-connect tube-to-metric-thread fitting designed for quick, tool-free tube connections in pneumatic and fluid systems. Constructed from nickel-plated brass, this fitting accepts a 4 mm outside diameter tube on one end and an M5 metric thread on the other. It is rated to 250 psi maximum working pressure and handles service temperatures from 0 degrees F to 160 degrees F. The Buna o-ring provides a reliable seal for compressed air and water applications. Each package contains 5 fittings, making it a practical restocking choice for mechanical contractors, industrial maintenance techs, and plumbing professionals working with metric-threaded manifolds or valve bodies.
This fitting is suited for residential and light commercial pneumatic control systems, compressed air distribution lines, and water service lines where an M5 metric thread port must transition to a 4 mm push-to-connect tube. Typical install scenarios include pneumatic actuator hookups, solenoid valve ports, and instrument tubing connections. Its compact profile fits in tight panel or cabinet installations. The nickel-plated brass construction resists corrosion in humid service environments, making it a durable choice for long-term compressed air or water service.
Designed for use with compressed air and water systems requiring a 4 mm outside diameter tube connection to an M5 metric thread port. Suitable as an OEM-style replacement or new installation fitting in pneumatic control and fluid distribution applications.
Installation is performed by mechanical, plumbing, or industrial maintenance technicians. Before servicing any pneumatic or fluid line, depressurize the system completely and isolate the supply. Ensure the tube end is cut squarely and deburred before inserting into the push-to-connect collet to achieve a proper seal. Verify thread engagement on the M5 port is complete before returning the system to service pressure.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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