Blue Anodized Aluminum Adapter (AN 814), -10 Male SAE O-Ring Boss (Straight Thread O-Ring) Hex Plug

That's what this plug is built for. The -10 dash size matches standard SAE O-Ring Boss ports, and the straight thread O-ring design seats against the port face rather than relying on thread deformation to make a seal. That means you get a consistent, leak-resistant closure even on ports that see repeated removal and reinstallation. Hex drive, so any standard wrench gets it done without any special tooling.

Constructed from blue anodized aluminum, this plug offers good corrosion resistance and should function well across a range of hydraulic fluid temperatures, as documented in Eaton's fluid compatibility reference. You can find a link to that document in the product details.