1Precise thread design for accurate fit. Hollow structure allows for wiring or ventilation. Easy to install, with strong sealing and corrosion resistance.2The hollow thread plug suits diverse scenarios. Its tight threads prevent leakage, and the hollow design enhances efficiency. Made of high - quality materials, it resists wear and has a long lifespan.3Unique hollow threads ensure stable connection and unobstructed passage of gas/liquid. Crafted with high - quality techniques, it has good adaptability and can handle complex working conditions easily.