Ever wonder if your hose assemblies were going to hold up? Now you can know for sure before you even install them! With Earl's Pressure Test Kit, it's easy. Just apply a little assembly lube to the flanges on both fittings, install and tighten the test caps on both ends, and pressurize the hose through the Schrader valve on one of the test caps. Submerge the entire assembly in water for one minute and if no bubbles appear, that's it – you're good to go!