Parker DC603-4 Brass Drain Cock Shutoff Valve Nptf

Product Description

The PARKER DC603-4 is a male pipe drain cock shutoff valve designed for fluid isolation and controlled drainage in pressurized piping systems. Built with a brass body, this valve connects via a 1/4-18 NPTF male thread and carries a maximum working pressure of 150 psi. The NPTF thread form provides a dry-seal connection without relying solely on thread sealant, reducing the risk of weep leaks in both gas and liquid service. Weighing just 0.1054 pounds, it is a compact, lightweight component suited for tight plumbing runs. Licensed plumbers and HVAC technicians install this type of drain cock as a service valve, blow-down port, or system drain point in residential and light commercial applications.

This drain cock is appropriate for use in pressurized water, air, and compatible fluid piping systems where a manual shutoff and drain point is required. The 1/4-18 NPTF thread size fits standard quarter-inch pipe connections commonly found on boilers, air compressors, hydronic heating circuits, and similar equipment. Its brass construction resists corrosion in water service environments, making it a dependable choice for long-term installations in mechanical rooms and utility spaces.

Key Features

• Brass body construction for corrosion resistance in water and compatible fluid service
• 1/4-18 NPTF male thread for a dry-seal, leak-resistant connection
• 150 psi maximum working pressure rating
• Rated for operation down to -65 degrees F minimum working temperature
• Compact and lightweight at 0.1054 pounds for use in tight piping configurations

Compatibility

Designed as an OEM-style replacement or new-installation drain cock for residential and light commercial piping systems utilizing 1/4-18 NPTF male pipe thread connections rated up to 150 psi.

Installation Notes

Installation should be performed by a licensed plumber or qualified mechanical technician in accordance with applicable IPC or IFGC requirements. Shut off system pressure and depressurize the line before removing or installing any drain cock valve. Apply appropriate thread sealant or PTFE tape to the male NPTF threads before installation to ensure a complete seal. Do not exceed the 150 psi rated working pressure for this valve.