$29, Flexible and Rigid Extension Adapter

Lincoln Lubrication 5858 LIN5858 Flexible and Rigid Extension Adapter Features and Benefits: Maximum working pressure: 5000 psi Allows operator to switch from flexible to rigid extension with one hand Overall length: 13" 1/8" NPT Model: LIN5858 Price: $29.18 Source: http://www.tooloutfitters.com/flexible-and-rigid-extension-adapter.html