Permanently plug unused holes–even deep or angled ones—in manifolds and other hydraulic or pneumatic components. The required installation tool reaches inside holes to expand these plugs with the pull of a trigger, making them a good choice for high-volume assembly. The tool lets you install them without risking damage to your equipment, unlike most plugs that have to be hammered in place. These plugs resist vibration better than threaded plugs and don’t require thread sealant.

They consist of a serrated sleeve with an internally threaded pin inside it. To install, you’ll need the installation tool fitted with a mandrel and nosepiece set (both sold separately). Thread your plug onto the mandrel, then position the plug within your hole. Press the tool’s trigger to pull the plug’s pin through the sleeve, expanding it. The outer serrations will bite into the hole to seal it shut. After expanding, the tool will automatically reverse its spin to pull away from the pin.

Steel-sleeved plugs handle pressures more than twice as high as aluminum-sleeved plugs. This makes them a better choice for hydraulic components.