Parker 426325003250-375 Polypak Seal 3.25x3.75 in

Product Description

The PARKER 426325003250-375 is a Polypak seal designed for hydraulic and pneumatic cylinder rod and piston applications. It features a 3.25-inch inner diameter, 3.75-inch outer diameter, and a 0.375-inch seal thickness. Rated for a maximum operating pressure of 2000 psi, this seal handles the demands of high-cycle reciprocating motion. The Polypak profile uses an energized lip geometry that maintains consistent sealing contact across a wide service temperature range of -20 degrees F to 250 degrees F. Licensed HVAC techs, plumbers, and hydraulic system technicians rely on this style of seal for reliable static and dynamic sealing in production and field-service environments.

This Polypak seal is suited for industrial hydraulic cylinders, pneumatic actuators, and fluid power systems where rod or piston sealing is required. It is referenced with 3/8 pipe thread sizing for installation context. Applications span both light industrial and heavy-duty equipment maintenance scenarios. Field technicians and maintenance professionals installing or rebuilding cylinder assemblies will encounter this seal in both OEM production and aftermarket repair settings.

Key Features

• Polypak energized lip profile maintains consistent contact under dynamic reciprocating motion
• Maximum operating pressure rated at 2000 psi for demanding hydraulic and pneumatic service
• Wide temperature range from -20 degrees F to 250 degrees F for varied operating environments
• 3.25 inches ID and 3.75 inches OD for precise bore and rod fitment
• 0.375 inches seal thickness for drop-in replacement installations
• Sold individually — package quantity of 1

Compatibility

Designed as an OEM-style replacement Polypak seal for hydraulic and pneumatic cylinder assemblies requiring a 3.25-inch ID, 3.75-inch OD, and 0.375-inch thick reciprocating rod or piston seal.

Installation Notes

Installation is typically performed by hydraulic system technicians or maintenance professionals. Fully depressurize and isolate the hydraulic or pneumatic circuit before disassembling any cylinder component. Use a seal installation tool or smooth mandrel to avoid cutting or rolling the lip during assembly. Inspect the rod or bore surface for scoring before installing the new seal, as surface defects will shorten seal service life.