Parker 398PD-4-4 Compression Double End Shutoff Pipe Fitting

Product Description

The PARKER 398PD-4-4 is a brass compression tube double end shutoff pipe fitting designed for fluid and gas line connections in HVAC, plumbing, and industrial service applications. It features a tube-to-pipe end connection configuration with a 1/4-18 NPTF thread standard, ensuring a pressure-tight seal on tapered pipe threads. Rated to a maximum working pressure of 150 psi and a temperature range of 0 to 150 degrees F, this fitting is suited for moderate-pressure service lines. Licensed tradespeople select this fitting when transitioning from compression tube runs to threaded pipe connections in tight or controlled-access installations.

The 398PD-4-4 is used in residential and light commercial HVAC systems, refrigeration line sets, plumbing supply runs, and similar fluid-handling assemblies where a shutoff function at both ends is required. Its double end shutoff design allows the line to be isolated at the fitting itself, reducing system downtime during maintenance or component swap-outs. The brass construction makes it appropriate for water, air, and compatible refrigerant or gas service within its rated limits.

Key Features

• Double end shutoff design isolates flow at the fitting for easier servicing
• Brass construction provides corrosion resistance for water, air, and compatible fluid service
• 1/4-18 NPTF thread ensures a pressure-tight tapered thread connection
• Tube-to-pipe end configuration transitions compression tube lines to threaded pipe
• Rated to 150 psi maximum working pressure
• Operating temperature range of 0 to 150 degrees F

Compatibility

Designed as an OEM-style replacement or new-installation fitting for compression tube-to-pipe connections requiring a double end shutoff in HVAC, plumbing, and light industrial fluid service assemblies.

Installation Notes

Installation should be performed by a licensed HVAC technician or plumber following applicable IFGC, IPC, or local mechanical codes. De-pressurize and isolate the system completely before removing or installing any compression fitting. Use appropriate tube cutters and deburring tools to ensure a clean, square tube end for reliable compression seal engagement. Do not overtighten the compression nut, as brass fittings can deform under excessive torque.

WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.