We know that golf balls go farther if they are clean. At least, that’s what we believe. Or you always use a clean pot to start cooking. The same thing is true for your Wedgle Direct-Inject Tree Injection unit. Any chemical product that is left in the unit will dry and keep the check valves from working properly. The garden hose adapter is the easiest way to clean it by snapping it onto the top coupler. For another option, check our instruction guide which is included with every unit or available online. For complete how-to info, training, use and maintenance videos, click here.