It is designed to block copper pipes and tubes, prevent dust and moisture from getting into the pipes, useful for HVAC and refrigeration equipment maintenance and repair.

Specification
Color: White
Bottom Diameter(small-end):4.5 mm/0.2 inch
Top Diameter(big-end):8.5 mm/0.3 inch
Applicable Hole Diameter: 7.94mm(5/16")
Height: 25.4mm / 1 inch
Material: Silicone
Packing List: 8 Pcs

Advantage
Cone-Shaped Design for Easy Removal: Our tube stoppers feature a convenient conical shape that makes them simple to remove from test tubes. They offer excellent sealing performance and high insulation.
Durable Material for Versatile Use: Crafted from robust materials, these stoppers resist deformation and withstand high temperatures, acids, and bases. Their sturdy construction ensures long-lasting reliability.
Reusable & Long-Lasting: Designed for repeated use, these stoppers provide a long service life, making them a cost-effective solution for your sealing needs.

Instruction
Easy to install, simply insert the rubber stopper into the pipe opening and twist to ensure a snug and secure fit.

NOTE: Please confirm the size before purchasing to ensure the suitability, sealing and use effect