NOSOK Sock Replacement Kit – 4" - VCA

The NOSOK 4” Filter Sock Replacement Kit is a simple, low-maintenance alternative to traditional filter socks and bulky fleece rollers. Designed for standard 4” filter sock systems, it gives you flexible mechanical filtration that’s easier to clean, easier to customize, and far less hassle to maintain. Use the included reusable 255-micron mesh screen for long-term filtration, wrap filter floss around the core for quick disposable maintenance, or combine both for a layered filtration setup that captures even more debris. The mesh screen unrolls flat for easy cleaning and reuse, while filter floss gives you a simple swap-and-discard option without dealing with dirty filter socks. Together, they create an efficient filtration system that keeps water cleaner with less effort.   Key Features Easier to maintain than traditional filter socks More versatile than standard filter cups Simpler than fleece roller systems Reusable 255-micron mesh screen included Compatible with filter floss for customizable filtration Ideal for reef tanks, sumps, and AIO systems   Compatibility Fits most standard 4” filter sock holders Compatible with Red Sea Reefer filter sock systems Supports openings from 3.5” to 4.18”   What’s Included Filter Cage Filter Core Ring Adapter 255-Micron Nylon Filter Screen Insert