Parker PP4BU4 Bulkhead Union Fitting 1/4 Inch Od

Product Description

The PARKER PP4BU4 is a push-to-connect bulkhead union tube fitting designed for tube-to-tube connections through a panel or bulkhead wall. It accepts 1/4 inch OD tubing on both sides and is constructed from polypropylene, making it well suited for applications where corrosion resistance and chemical compatibility are priorities. The fitting is rated to 150 psi and provides a secure, tool-free connection. HVAC technicians, plumbers, and fluid-system installers use this fitting type when routing tubing through enclosures, panels, or equipment housings where a sealed pass-through is required.

This fitting is appropriate for residential and light commercial applications involving pneumatic tubing, water lines, or compatible fluid transfer systems. The push-to-connect design allows fast assembly without compression nuts or ferrules. Its polypropylene construction makes it a practical choice in environments where metal fittings would be subject to corrosion from moisture or mild chemicals. It ships individually and is sold as a single unit.

Key Features

• Push-to-connect design allows tool-free tube insertion and secure hold
• Bulkhead configuration enables panel or wall pass-through installations
• Polypropylene construction resists corrosion and many common chemicals
• Rated to 150 psi for reliable performance in low-to-medium pressure systems
• Accepts 1/4 inch OD tubing on both sides for a straight-through union
• Tan color finish for easy visual identification in multi-line installations

Compatibility

Designed as an OEM-style replacement or new-installation fitting for systems using 1/4 inch OD push-to-connect tubing in pneumatic, water, or compatible fluid transfer applications.

Installation Notes

Installation is performed by trade professionals including HVAC technicians and plumbers. Before servicing or installing, depressurize the system and isolate the fluid supply. Ensure tubing ends are cut cleanly and squarely to achieve a proper seal in the push-to-connect collet. Verify that the tubing OD and the system fluid or gas are compatible with polypropylene before use.