Parker 394P-6-6 Single End Shutoff Coupler 3/8 Inch Brass

Product Description

The PARKER 394P-6-6 is a brass compression-style single end shutoff coupler designed for tube-to-tube connections in fluid and pneumatic line applications. This fitting allows one end of a line to be disconnected while automatically shutting off flow, preventing spillage or pressure loss during service. Constructed from brass, it handles working pressures up to 150 psi and temperatures ranging from 0 degrees F to 150 degrees F. It is sized for 3/8-inch outside diameter tubing and uses a compression-style end connection on both ports. Plumbers, HVAC technicians, and industrial piping professionals install this coupler where quick disconnection and automatic shutoff are required without full system depressurization.

This coupler is suited for residential and light commercial fluid handling systems where tube-to-tube connections must be serviceable without draining entire lines. Typical applications include refrigeration lines, compressed air distribution, hydraulic circuits, and water supply runs where maintenance access is needed at discrete points. The single end shutoff design means flow is blocked on the supply side when the coupler is separated, keeping the upstream line pressurized and reducing fluid loss during component swaps or line repairs.

Key Features

• Single end shutoff design blocks upstream flow automatically on disconnect
• Brass construction provides corrosion resistance for water, air, and refrigerant-compatible service
• Compression tube fittings on both ends accept 3/8-inch outside diameter tubing without welding or soldering
• Rated to 150 psi maximum working pressure
• Operates across a temperature range of 0 degrees F to 150 degrees F

Compatibility

Designed as an OEM-style compression coupler for tube-to-tube connections using 3/8-inch outside diameter tubing in fluid and pneumatic systems rated within the specified pressure and temperature limits.

Installation Notes

A licensed plumber or qualified HVAC technician should install this fitting in compliance with applicable codes, including IPC and relevant local piping standards. Depressurize and isolate the line segment before disconnecting or installing the coupler. Use appropriate tube cutting and deburring tools to ensure a clean, square tube end for a leak-free compression seal. Do not overtighten compression fittings; follow standard compression fitting assembly practice and inspect for leaks after restoring system pressure.