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

The key detail is that it is an HK Series Industrial Interchange coupling built to ISO 7241-1 Series B dimensional requirements, in size -08. That combination is what you match against your existing Series B, -08 quick disconnect.

This Eaton HK Series dust plug is designed to meet ISO 7241-1 Series B dimensional standards, so it should fit any compatible -08 coupling made to that spec.

Buna-N is the standard seal, which handles a range from -40F up to 250F. If your application runs hotter or involves fluids that aren't compatible with Buna-N, there are several alternatives available: Neoprene, PTFE, FKM, EPDM, and Kalrez. FKM tops out at 400F on the high end, making it the go-to choice when heat is a real concern. EPDM stretches down to -65F and up to 300F, which covers a lot of ground for cold-weather or moderate-heat setups.