For temporary shut-off of tubing without pinching it off or installing a valve. Especially handy for plumbing, heating, refrigeration and instrumentation when troubleshooting for leaks. Lightweight, fast acting, dependable. Insert plug in tube end and tighten wing nut. Expander seals tube and holds pressures to 100 PSI.142-F 3-Pc. test plug kit for 1/2”, 5/8” and 7/8” O.D. tubing. Wt. .5 lbs.cutter wheel.