Parker FB4WY4-HBLK Push-to-connect Union 1/4 Inch Od

Product Description

The PARKER FB4WY4-HBLK is a push-to-connect union tube fitting designed for fast, tool-free connections in fluid and pneumatic systems. Built from Kynar (PVDF) with an FKM o-ring, it handles a working pressure of 250 psi and a vacuum rating of 28 in-Hg, making it suitable for demanding chemical-resistance applications. Rated for 1/4-inch OD tubing, the fitting accepts the tube from both ends without threading or compression tooling. The black color designation identifies this as the Kynar variant within the FB4 series lineup. HVAC technicians, plumbers, and industrial service pros install these fittings where corrosion resistance and quick assembly matter.

This fitting is used in residential and light commercial fluid handling systems, chemical distribution lines, and pneumatic control circuits where Kynar-grade chemical resistance is required. The push-to-connect design suits applications where repeated service access is expected, such as filter manifolds, sample lines, and instrument tubing runs. Its compact form factor fits tight panel and cabinet installations. The FKM o-ring provides compatibility with a broad range of aggressive media beyond standard water service.

Key Features

• Push-to-connect design allows tool-free tube insertion and release
• Kynar (PVDF) body offers excellent chemical and UV resistance
• FKM o-ring for broad fluid compatibility including aggressive chemicals
• 250 psi working pressure rating
• 28 in-Hg vacuum rating for low-pressure suction applications
• Accepts 1/4-inch OD tubing from both union ends

Compatibility

Designed as an OEM-style push-to-connect replacement union for systems using 1/4-inch OD tubing where Kynar-body fittings are specified.

Installation Notes

Installation does not require tools — cut tubing squarely, deburr the end, and push fully into the fitting until the tube seats against the internal stop. Shut off and depressurize the system completely before disconnecting or replacing any fitting. Verify tubing OD is exactly 1/4 inch; semi-rigid or soft tubing that is out of round may not seal reliably. Follow applicable plumbing or pneumatic system codes for the jurisdiction and application type.