HK Series Industrial Interchange Series B Dust Cap, -08 Coupling

Buna-N is the standard seal, which handles a range of negative 40 up to 250 degrees Fahrenheit. If your application runs hotter than that, FKM seals are available and rated up to 400 degrees. EPDM is another option if you need something that can handle down to negative 65 on the cold end while still reaching 300 degrees on the high side. So there are a few paths depending on what you're dealing with.

Absolutely, this dust cap is specifically designed for a -08 coupling size in the Eaton HK Series.

It is made for a -08 coupling size and the end is listed as female with a 0.5 inch end size.