The WedgeChek Exchange Program allows a trade of one bundle of WedgeCheks for one Wedgle or Portle Tip and two bundles for a Portle Palm Tip. At no charge. WedgeCheks are self-sealing plugs and used when making injections with our Wedgle or WedglePlus injection tips to keep the chemical in the tree and keep out the air and pests when the tip is withdrawn. As the tree grows, the WedgeChek is pushed out of the tree. For training and testing purposes, 20 WedgeCheks are included with every injection unit purchase. One bundle of WedgeCheks, sufficient to make 130 injections, is included with every 120 ml chemical pack. Eight bundles are included with the 1000 ml chemical pack used with our high-volume kit. For more information, click here.