Parker 4BLEN4-B Compression Tube End Cap Brass

Product Description

The PARKER 4BLEN4-B is a brass compression tube end cap designed to seal the open end of a 0.25-inch OD tube in instrumentation, fluid power, and process piping systems. The fitting uses a compression-style end connection, eliminating the need for soldering, flaring, or threading. It is rated to a maximum working pressure of 3500 psi, making it suitable for high-pressure service lines. Plumbers, pipefitters, and instrumentation technicians install this fitting when a tube run must be capped off cleanly while maintaining pressure integrity. The all-brass construction resists corrosion and holds up in wet or chemically active environments.

This end cap is used to terminate 0.25-inch OD compression tubing in residential, commercial, and industrial applications. Typical install scenarios include capping unused ports on manifolds, sealing off branch lines during system commissioning, and blanking tube ends during maintenance. It is suited for pneumatic, hydraulic, and fluid process systems where a secure, leak-free seal is required without permanent modification to the tubing.

Key Features

• Compression end connection — no soldering, threading, or flaring required
• Rated to 3500 psi maximum working pressure for high-pressure service
• Fits 0.25-inch OD tubing for precise, repeatable sealing
• Brass construction provides corrosion resistance in wet and process environments
• Compact single-piece design for clean tube termination

Compatibility

Designed as an OEM-style compression end cap for 0.25-inch OD tubing. Cross-references to Swagelok part number B-400-C for reference during sourcing and replacement.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified instrumentation technician. Depressurize and isolate the system completely before removing or installing any compression fitting. Hand-tighten the fitting body onto the tube, then advance with a wrench per standard compression fitting procedure — do not overtighten. Verify the system with a pressure test after installation before returning it to service.