Err doesn't he already have 2 of those? One F NPT (assume 1/8) One M NPt (same assumption)You need this part.
middle left in photo..
Just take the one and screw it into the solenoid.. slide valve onto "tube" , tighten... Slide other onto othe side.. Add barb of your choice to the F NPT
Remaining blue capped parts and the tube are for ?????