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. WedgeCheks are self-sealing and used when making injections with our Wedgle or WedglePlus injection tips to keep the chemical in the tree when the tip is withdrawn. But WedgeCheks are not used with the Portle or Portle Palm Tips. Our WedgeChek Exchange Program allows you to exchange one bundle for one Wedgle or Portle Tip and two bundles for a Portle Palm Tip. At no charge. For more information on our injection tips, click here.