Assembling braided AN hose and hose ends is pretty straightforward. But how do you know if the completed assembly is OK? Ideally, you would pressure-test your plumbing before you go to a bunch of trouble installing it in the car. That’s where the folks from Earl’s Performance enter the equation. They have a pretty cool Pressure Test Kit that will allow you to test most any size AN hose assembly.
The Earl’s kit consists of AN hose end plugs for every line size from -3 through -16 AN, plus another plug modified with a common Schrader valve. It’s easy to use—just screw the appropriate AN plug in one end of the assembly and a Schrader valve plug in the other. Attach a compressed air (or nitrogen) source to the Schrader valve plug to fill the hose, then dunk the whole assembly under water. Bubbling water will tell if (and where) the assembly is leaking. As the saying sort-of goes, you can find and fix a leaky hose now, or you can find it later when it’s making a mess in your car.