This transparent polypropylene cap for Test Tubes Proves to be an excellent protection to the contents to the tubes. The grooves inside the cap tighten the fitting on the tube while the outer groove would hold identification labels. The built in seal ring would set in the tube making the combination a leakproof one.  

This transparent polypropylene cap for Test Tubes Proves to be an excellent protection to the contents to the tubes. The grooves inside the cap tighten the fitting on the tube while the outer groove would hold identification labels. The built in seal ring would set in the tube making the combination a leakproof one.