WedgeCheks are self-sealing plugs and used when making injections with our Wedgle Injection Tips to keep the chemical in the tree when the tip is withdrawn. They are simple to use – Using the short end of the WedgeChek Punch or SpeedChek Punch, push a rubber WedgeChek into each hole in the bark. Then the Wedgle Injection Tip is inserted into the WedgeChek through the bark. The WedgeChek seals as the Tip is withdrawn, keeping chemical in the tree and keeping out air and pests. As the tree grows, the WedgeChek will be pushed out of the tree. For more information, click here.