Radium 6AN ORB to 8.5mm Hose Barb Fitting 45mm wastegate What does this mean

What does this mean

Package Contents:

The optional Radium Engineering pressure cap (sold separately) is manufactured from stainless steel with a race proven high pressure valve

a Turbosmart 7170 Turbocharger and a Turbosmart Gen V 50mm Progate

our kits come in THREE configurations:

Radium 6AN ORB to 8.5mm Hose Barb Fitting 45mm wastegate What does this meanDescription These anodized billet aluminum adapter fittings can be used in any application using a 9 16" 18 O ring port. This is the same thread pitch used in 6AN (ORB=O Ring Boss). They all feature FKM (Viton) O rings for all oil and fuel types. 14 0195 is used in Radium fuel pressure regulators and Radium standard fuel surge tanks. 14 0245 is commonly used for standard fuel surge tanks that require a 8AN male fitting. 14 0291 is used in Radium