Parker DC604-4 Drain Cock Shutoff Valve 1/4 Inch Nptf

Product Description

The PARKER DC604-4 is a brass drain cock shutoff valve designed for fluid and air system drain points where a reliable manual shutoff is required. It uses a 1/4-18 NPTF external-seal thread that forms a pressure-tight connection without relying solely on thread compound. Rated to 150 psi maximum working pressure, this valve handles the demands of compressed air, hydraulic drain circuits, and plumbing drain service. At 0.043 pounds, it is a compact, lightweight fitting suited for tight installation spaces. Licensed plumbers, HVAC technicians, and fluid-power mechanics are the typical installers.

The DC604-4 is appropriate for residential and light commercial applications where a low-profile manual drain point is needed. Common install scenarios include drain ports on air receivers, compressor tanks, filter housings, hydraulic reservoirs, and small-bore water or pneumatic lines. The 1/4-18 NPTF thread size is a standard port size found across a wide range of OEM and aftermarket equipment in these categories.

Key Features

• 1/4-18 NPTF external-seal thread provides a pressure-tight connection at the fitting interface
• 150 psi maximum working pressure suits compressed air, pneumatic, and light hydraulic drain service
• Brass body material resists corrosion in air, water, and many fluid-power media
• Rated for operation down to -65 degrees F, suitable for cold-climate and refrigeration-adjacent installations
• Compact, lightweight construction at 0.043 pounds minimizes added load on drain ports

Compatibility

Designed as an OEM-style replacement or new-installation drain cock for any equipment with a standard 1/4-18 NPTF drain port, including compressed air systems, filter housings, and small-bore hydraulic or pneumatic circuits.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or fluid-power mechanic. Before installing or replacing this valve, depressurize and drain the system completely to prevent injury. NPTF threads are designed for pressure-tight metal-to-metal sealing, but applying an appropriate thread sealant is standard practice per IPC and IFGC guidelines for fluid systems. Do not overtighten, as brass fittings are susceptible to thread damage from excessive torque.