Hydro Flow 3/4 Inch Figure-Eight Poly Tube Clincher Hydro Flow Figure-Eight Poly Tube Clincher is an easy and effective way to block off the end of the line Simply run one end of the poly tubing through one side, bend back and then run back through the other side Sold in case quantities only Hydro Flow Figure-Eight Poly Tube Clincher is an easy and effective way to block off the end of the line Simply run one end of the poly tubing through one side, bend back and then run back through the other side These clinchers are easy to use and reliable