Radium SAE adapter fittings are available in 5/16", 3/8", and 1/2" sizes. They push-on and secure to most modern USA, European and Japanese fuel injection systems and are used to convert an OEM SAE Quick Connect connection. Vehicle Fitment: Universal Application Includes: (1) Adapter Fitting Full Description: These adapter fittings are available in 5/16", 3/8", and 1/2" sizes. They push-on and secure to most modern USA, European, Japanese, etc. fuel injection systems and are used to convert an OEM SAE Quick Connect connection. The unique Radium Engineering adapter (20-0290 and 20-0291) interfaces with a SAE Quick Connect male fitting in an ultra-low profile manner. The design uses a dual viton O-ring seal for a leak free connection. The retaining clip is held on with a stainless steel screw and is easily and quickly serviced.