These adapter fittings are designed to be used in many Radium products including fuel rails, surge tanks, fuel pressure regulators, etc. However, they can be used in any application using a 3/4"-16 O-ring port which is the same thread pitch used in -8AN fittings. 14-0154 is a low profile 90 degree swiveling adapter (shown below) for tight locations. 14-0118 is a CNC billet aluminum adapter fitting which has machined female 1/8 NPT threads, as shown below. It is commonly used to easily adapt a fuel pressure sensor, fuel pressure gauge, etc. to a fuel rail or regulator. The surface is Type-II anodized with a R5 bright dipped finish to resist corrosive fuels such as ethanol, methanol, E85, etc. 14-0150 is a unique CNC billet aluminum round plug that uses an internal hex for a compact and cosmetic appearance.