O-Ring Face Seal Steel Plug for 9/16-18 Thread Hydraulic Fittings

Description

When you’ve got an open hydraulic port that needs capping or a test point that requires a temporary seal, this steel OFS plug handles the job without drama. When you’re dealing with hydraulic systems, having the right adapter can make or break your day. Whether you’re closing off unused remotes, sealing test ports during troubleshooting, or temporarily plugging a line while making repairs, this plug gives you a clean, leak-free seal every time.

What You’re Getting

• O-ring face seal design that seals on the face, not the threads – no worries about thread damage affecting the seal
• Steel construction that handles hydraulic pressures without deforming or cracking under load
• Standard 9/16-18 thread fits a wide range of hydraulic fittings and adapters commonly found on tractors
• Direct replacement for worn or damaged plugs – no modifications needed

Built for Real Farm Work

This adapter is designed for tractors and equipment that run hydraulic implements like loaders, backhoes, mowers, and remote cylinders. You’ll find these 9/16-18 threads on hydraulic blocks, valve assemblies, and remote couplers across many tractor brands. This plug is handy for sealing unused ports when you’ve removed implements or need to cap lines during system maintenance.

Made to Last

Steel construction means this plug won’t strip out or crack like cheaper alternatives might. The O-ring face seal design is more forgiving than pipe thread plugs – you get a reliable seal even if the threads aren’t perfect. Weatherhead has been making hydraulic fittings for decades, and this adapter shows why they’re trusted by farmers and mechanics worldwide.

Good to Know

Always use proper thread sealant on hydraulic fittings – never just tape that can contaminate your system. Clean both fitting surfaces before connecting, and don’t over-tighten as this can damage the threads or crack the fitting body. A snug fit with proper sealant beats overtightening every time. The O-ring does the sealing work, so you don’t need to crank it down tight.