Parker 66PLP-5-4 Push-to-connect Female Connector

Product Description

The PARKER 66PLP-5-4 is a push-to-connect tube-to-female NPT fitting designed for inline tube connections in pneumatic and fluid-handling systems. It provides a tube-inlet-to-female-thread-to-tube-outlet configuration, allowing technicians to join 5/16 inch OD tubing to a 1/4 inch NPTF female port without tools on the tube side. The body is nickel-plated brass, rated to 300 psi maximum working pressure, and handles temperatures from 0 degrees F to 200 degrees F. The push-to-connect button is black, flame-resistant material rated to UL94 V-0. Sealing is performed by a nitrile O-ring. HVAC, refrigeration, and pneumatic control technicians are the primary installers of this fitting type.

This fitting is suited for residential and light commercial pneumatic control lines, instrument air tubing, and low-pressure fluid circuits where a quick-connect inline female port is needed. The NPTF thread form provides a pressure-tight seal on the threaded side without relying solely on thread sealant. The overall installed length of 1.45 inches makes it a compact inline solution for panel-mounted or manifold-mount applications where space is limited. Typical use cases include pneumatic actuator supply lines, control tubing in HVAC air-handling units, and instrument tubing runs in mechanical rooms.

Key Features

• Push-to-connect ends accept 5/16 inch OD tubing without ferrules or wrenches on the tube side
• 1/4 inch NPTF female center port provides a pressure-sealing threaded connection
• Nickel-plated brass body resists corrosion in damp mechanical environments
• Nitrile O-ring seals maintain integrity across the full temperature range
• UL94 V-0 rated flame-resistant release button for safety in temperature-sensitive installations
• Compact 1.45 inch overall length suits tight inline routing

Compatibility

Designed as an OEM-style push-to-connect inline fitting for pneumatic and fluid-handling systems using 5/16 inch OD tubing and 1/4 inch NPTF female ported components.

Installation Notes

Installation is performed by licensed HVAC technicians or qualified plumbing and pneumatic control mechanics. De-energize and depressurize the system fully before removing or installing any fittings. Ensure tubing is cut square, deburred, and clean before inserting into the push-to-connect end to achieve a proper seal. Apply thread sealant or PTFE tape to the NPTF port threads as required by local mechanical codes before making up the threaded connection.