Parker FB4BU4-HBLK Bulkhead Union Fitting 1/4 Inch Od

Product Description

The PARKER FB4BU4-HBLK is a push-to-connect bulkhead union tube fitting designed for tube-to-tube connections through a panel or bulkhead wall. Constructed from Kynar (PVDF) with a black finish, this fitting accepts 1/4 inch OD tubing on both sides and forms a secure, tool-free connection rated to 250 psi. The FKM o-ring provides compatibility with a wide range of fluid media, including aggressive chemicals. It also carries a vacuum rating of 28 in-Hg, making it suitable for both pressure and vacuum service. Plumbers, HVAC technicians, and industrial service techs use this fitting where tubing must pass through a panel wall with a leak-free seal on each side.

This fitting is used in residential and light commercial applications where corrosion resistance and chemical compatibility are required. Typical installations include refrigeration drain lines, chemical feed systems, pool and spa equipment plumbing, and instrumentation tubing routed through enclosures or panels. The Kynar body holds up to harsh fluid exposure, and the push-to-connect mechanism allows for quick field installation without soldering, threading, or compression tools.

Key Features

• Push-to-connect design for tool-free tube insertion and release
• Kynar (PVDF) body for superior chemical and corrosion resistance
• FKM o-ring compatible with a broad range of aggressive media
• Rated to 250 psi pressure and 28 in-Hg vacuum
• Bulkhead-style body mounts through panels with connections on both sides
• Black color for easy visual identification in multi-line installations

Compatibility

Designed as an OEM-style replacement push-to-connect bulkhead union for systems using 1/4 inch OD tubing where Kynar material and FKM o-rings are specified.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or instrumentation technician. Shut off fluid supply and relieve system pressure before removing or installing any fitting. Ensure the panel cutout diameter matches the fitting body before seating the bulkhead nut. Confirm tubing OD and cut tubing square with a clean, burr-free end before inserting into the push-to-connect port to ensure a proper seal.