Steel Adapter, 1-5/8-12 Male SAE O-Ring Boss (Straight Thread O-Ring) Hex Plug

For chemical processing and food and beverage applications, this adapter is listed as suitable right out of the specs. The included seal part (22617-20) is paired with the plug from the factory, so you're not hunting down a separate o-ring to make it work. The straight thread o-ring boss design gives you a reliable metal-to-metal seat with the o-ring doing the sealing work, which tends to hold up better in process environments than tapered thread connections that rely on thread engagement alone. Marine, military, offshore drilling, and pulp and paper are also listed applications, so the material and sealing approach are built with demanding service in mind.

Chemical processing is actually one of the listed application areas for this plug, along with marine, military, pulp and paper, food and beverage processing, and offshore drilling. The SAE O-Ring Boss straight thread design gives it a reliable seal that holds up in demanding process environments, which is why it shows up across that range of industries.

That's correct. This Eaton Aeroquip adapter is a straight thread O-ring boss plug, so it has threads on the inside and a hex shape on the outside for tightening. It's designed to seal an O-ring boss port.