Parker 1/4 Hhp-s Hollow Hex Plug 1/4 Inch Mnptf

Product Description

The PARKER 1/4 HHP-S is a hollow hex plug designed for industrial pipe and fluid system applications. It installs into a 1/4 inch MNPTF (male national pipe taper fuel) threaded port to seal or cap a line while maintaining a rated maximum working pressure of 6000 psi. The hollow hex drive allows for installation and removal with standard hex key tooling, making it well suited for tight quarters where a conventional wrench cannot engage a full hex head. Licensed plumbers, pipefitters, and industrial maintenance technicians are the primary installers of this fitting.

This plug is used in high-pressure hydraulic, pneumatic, and fluid power systems where a threaded port must be capped or temporarily blocked. The 1/4 inch MNPTF thread conforms to National Pipe Taper Fuel standards, providing a pressure-tight metal-to-metal seal when properly torqued into a female NPT or NPTF port. Typical install scenarios include manifold port plugging, test port capping, and system dead-ending during maintenance or reconfiguration in both industrial and commercial settings.

Key Features

• 6000 psi maximum working pressure rating for demanding hydraulic and fluid power systems
• 1/4 inch MNPTF thread classification provides a pressure-tight taper seal
• Hollow hex drive design allows installation with a hex key in restricted access areas
• Overall length of 7/16 inches keeps the plug profile compact in tight port arrangements
• 1/4 inch hex size matches standard hex key sets commonly found in trade toolkits

Compatibility

Designed as an OEM-style replacement or service fitting for industrial pipe and fluid power systems equipped with 1/4 inch female NPT or NPTF threaded ports rated to 6000 psi or below.

Installation Notes

Installation is performed by a licensed pipefitter, plumber, or qualified hydraulic system technician. Depressurize and isolate the affected line or circuit fully before removing or installing any threaded plug. Apply appropriate thread sealant or PTFE tape as required by the system fluid and applicable plumbing or fluid power codes. Do not overtighten; follow the system manufacturer or applicable industry standard guidelines for NPTF taper thread engagement turns.