Parker DC604-6 Drain Cock Shutoff Valve 3/8 Inch Brass

Product Description

The PARKER DC604-6 is an external seal drain cock shutoff valve designed for 3/8 inch pipe connections with a 3/8-18 thread specification. Built from brass, this valve provides reliable manual shutoff and drainage capability in pressurized fluid systems. It is rated to a maximum working pressure of 150 psi and carries a minimum working temperature rating of -65 degrees F, making it suitable for a wide range of service conditions. Plumbers, pipefitters, and HVAC technicians install this type of valve where periodic system drainage or isolation is required. The external seal design helps maintain leak-free performance at the stem without requiring internal packing adjustments.

This drain cock is used in residential and light commercial plumbing, hydronic heating, compressed air, and general fluid-handling systems wherever a compact, inline manual drain point is needed. Its brass construction makes it well-suited for water, air, and compatible fluid service lines. Typical installation locations include boiler drain points, system low points, equipment isolation lines, and service valves on small-diameter piping runs where a 3/8 inch connection is specified.

Key Features

• Brass body construction for corrosion resistance in water and air service
• 3/8-18 thread size for standard 3/8 inch pipe connections
• 150 psi maximum working pressure rating
• Minimum working temperature of -65 degrees F for cold-environment service
• External seal design reduces stem leakage without internal packing maintenance
• Compact drain cock form factor fits tight installation spaces

Compatibility

Designed as an OEM-style replacement or new-installation drain cock for 3/8 inch pipe systems requiring a 3/8-18 threaded shutoff and drain valve in plumbing, HVAC hydronic, or compressed air applications.

Installation Notes

Installation should be performed by a licensed plumber or qualified pipefitter following applicable IPC or local plumbing code requirements. Shut off system pressure and depressurize the line fully before removing any existing valve or installing this drain cock. Use appropriate thread sealant or PTFE tape on the male threads per system fluid compatibility. Do not overtighten threaded connections into brass fittings, as the material is subject to cracking under excessive torque.