Boost Control Solenoid Kit. Includes: Boost Control Solenoid, 2 X 1/8 in NPT to 3/16 in Barb Adapter & Muffler Boost Control Solenoid Kit, Includes 3-Port Boost Control Solenoid, 2 X 1/8-inch NPT to 3/16-inch Barb Adapter and Muffler