YKK Vislon #10 Separating Zipper AutoLok with double pull is built for durability in outdoor and marine settings, making it a practical upgrade for patio covers, boat enclosures, and heavy-duty jackets. This 30-inch zipper features heavy-duty, molded plastic teeth constructed from POM (polyacetal resin), offering excellent corrosion and chemical resistance--ideal for withstanding salty air, sun, and harsh weather. The two-way separating design and AutoLok slider provide smooth, reliable opening and closing from either end, while the double pull sliders add convenience. Its black finish and robust construction work well on tents, marine upholstery, and technical outerwear, bringing easy operation and long-lasting strength to any project. If you need a zipper that stands up to both use and the elements without fuss, the YKK Vislon #10 delivers straightforward performance you can trust.