This is a set of fittings for those who may already have a eCtune/Hondata/Xenocron style solenoid but still need the appropriate fittings. This is the same "kit" we include with our solenoids. Comes with two brass barbed fittings and one breather fitting. All of the included fittings are 1/8" NPT , and the barbed fittings are for 1/4" ID hose. Please verify that your solenoid has the proper size inlet/outlet/vent before ordering.