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.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.