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. To determine the required SAE size, simply measure the outside diameter of the male fitting as shown in the photos. • 0.3125 = 5/16" • 0.375 = 3/8" • 0.50 = 1/2" Important Install Notes: Always lubricate the mating O-rings with a light amount of oil prior to installing. Image Part Number SAE Size to 14-0367 5/16" SAE Male 8AN ORB 14-0368 3/8" SAE Male 8AN ORB 14-0337 5/16" SAE Male 10AN ORB 14-0338 3/8" SAE Male 10AN ORB 14-0146 5/16" SAE Male 6AN Male 14-0147 3/8" SAE Male 6AN Male 14-0231 1/2" SAE Male 6AN Male 14-0358 3/8" SAE Male 1/8 NPT Male 14-0227 3/8" SAE Female 90° 5/16" Barb 14-0253 3/8" SAE Female 5/16" Barb 14-0453 5/16" SAE Female 3/8" Barb 20-0290 5/16" SAE Female 6AN Male (Low Profile) 20-0291 3/8" SAE Female 6AN Male (Low Profile)