Parker 398PDSS-4-2 Double End Shutoff Pipe Coupler

Product Description

The PARKER 398PDSS-4-2 is a double end shutoff pipe coupler designed for use in compressed fluid and instrumentation tubing systems. It features compression-to-male NPT (MNPT) end connections with a 1/8-27 thread size, allowing technicians to connect or disconnect tubing lines while automatically shutting off flow at both ends. Constructed from 316 stainless steel, this coupler is suited for applications requiring corrosion resistance and durability under a maximum working pressure of 150 psi. Plumbers, pipefitters, and instrumentation technicians install this fitting in process, industrial, and specialty fluid systems.

This coupler is used in residential and commercial applications where a reliable, leak-free compression connection to a male NPT port is needed. The double end shutoff design is particularly useful in service and maintenance scenarios where disconnecting a line without draining the system is required. The 316 stainless steel construction makes it appropriate for corrosive media, outdoor installations, and sanitary fluid handling environments.

Key Features

• Double end shutoff design automatically closes both sides upon disconnection, minimizing fluid loss
• 316 stainless steel construction provides corrosion resistance for demanding environments
• Compression x MNPT end connections for straightforward integration into existing NPT-threaded ports
• 1/8-27 thread size meets standard MPT specifications
• Rated to 150 psi maximum working pressure

Compatibility

Designed as an OEM-style replacement or direct-install compression tube fitting for instrumentation, process, and fluid handling systems requiring a 1/8-27 MNPT port with compression tube connection.

Installation Notes

Installation should be performed by a qualified plumber or pipefitter in accordance with applicable piping codes such as the IPC. Always depressurize and isolate the system before removing or installing any fitting. Use appropriate tube preparation tools to ensure a clean, square tube end for a leak-free compression seal. Do not overtighten compression fittings; follow standard hand-tight-plus-turns practice for compression connections.