Need to keep pesky bugs out of your tubing? Bug plugs prevents pests from entering the open ends of 1/4 in. tubing. These plugs are also designed to be used with high flow emitters and bubblers to diffuse water through the end of tubing in a way that reduces soil erosion. Push them in by hand; a fitting inserter tool such as the 3-in-1 Hole Punch Tool or 4-in-1 Cut N Punch Tool will also do the trick. Bug plugs are made of polypropylene (PP) treated with UV inhibitors.