Spare Parts & Extensions for CaddyStack™ - Modular Filter Tower

CaddyStack™ – Modular Filter Tower Extensions & Spare Parts These CaddyStack™ Modular Filter Tower Extensions are individual replacement and expansion components designed to work with the CaddyStack™ – Modular Filter Tower (Filter Sock Replacement Kit) This product page is intended for reef keepers who already own a CaddyStack™ Starter Kit and want to: Replace a specific part Add more filtration stages Experiment with different media configurations Build out additional towers New to CaddyStack™? If you don’t already own a Starter Kit, we strongly recommend starting here: CaddyStack™ – Modular Filter Tower (Filter Sock Replacement Kit) Starter Kits include all core modules needed to build a complete system. What These Parts Are For CaddyStack™ Extensions allow you to customize and fine-tune filtration by adding or swapping individual modules instead of replacing your entire setup. Each part: Twist-locks into existing CaddyStack™ towers Is fully compatible within its size category Lets you expand or modify your filtration anytime These are not standalone filtration systems — they are modular building blocks for your existing CaddyStack™ platform. Available Sizes Spare parts are available in: 2" 2.75" 4" 7" All modules keep the same height system — only the diameter changes. CADDYSTACK™ EXTENSIONS – EXACT DIMENSIONS (READ BEFORE BUYING) These are individual parts — NOT full kits. All components are sized to match your existing CaddyStack™ system. 2" CaddyStack™ Parts Compatible System Diameter: 2" class (58mm mount) Circle Mount: 58mm diameter × 5mm tall Short Tube: 47mm diameter × 23mm tall Short Cage: 47mm diameter × 23mm tall Tall Tube: 47mm diameter × 58mm tall Tall Cage: 47mm diameter × 58mm tall 2.75" CaddyStack™ Parts Compatible System Diameter: ~2.5" Circle Mount: 2.56" diameter × 0.24" tall Short Tube: 2.48" diameter × 1.26" tall Short Cage: 2.48" diameter × 1.26" tall Tall Tube: 2.48" diameter × 3.19" tall Tall Cup: 2.48" diameter × 3.19" tall Tall Cage: 2.48" diameter × 3.19" tall 4" CaddyStack™ Parts Compatible System Diameter: ~4" Circle Mount: 4.04" diameter × 0.31" tall Rectangle Mount: 7" length × 4.33" width × 0.98" tall Short Tube: 3.46" diameter × 1.26" tall Short Cage: 3.46" diameter × 1.26" tall Tall Tube: 3.46" diameter × 3.31" tall Tall Cup: 3.46" diameter × 3.31" tall Tall Cage: 3.46" diameter × 3.31" tall 7" CaddyStack™ Parts Compatible System Diameter: ~7" Circle Mount: 7" diameter × 0.63" tall Short Tube: 6.30" diameter × 1.46" tall Tall Tube: 6.30" diameter × 3.19" tall Tall Cup: 6.30" diameter × 3.19" tall Tall Cage: 6.30" diameter × 3.19" tall Available Modular Components Mounting Options Circle Mount Designed for standard round filter sock openings (including WATERBOX) Common in most sump systems Drops directly in for even flow Square Mount (2.75" Only) Designed for flat-edge AIO chambers Works with systems like: UNS AIO Landen Hello Reef Dimensions: 2.5" × 2.5" × 2.75" Rectangle Mount (4" Only) Designed for rectangular filter sock holders Compatible with systems using: https://www.eshopps.com/product/rectangular-filter-sock/ Allows you to convert a rectangular sock chamber into a 4" CaddyStack™ system Short Modules (1" Tall) Short Cage Module Open, high-flow design Ideal for quick mechanical filtration Short Tube Module Solid sidewalls Forces water downward through media Tall Modules (3" Tall) Tall Cage Module Open design for maximum flow Ideal for carbon, biomedia, or high-flow setups Tall Tube Module Forces water through media for better contact time Great for layered filtration setups Tall Cup Module Works like a traditional filter cup Drop in and fill with: Filter floss Pads Carbon GFO Biomedia To clean: replace media — no washing socks Why Buy Extensions Instead of Another Kit? CaddyStack™ is built as a long-term filtration system, not a disposable one. Extensions let you: Replace worn parts Expand for higher bioload tanks Fine-tune filtration over time Customize flow and media strategy Expandable by Design Your system grows with your reef. You can: Stack additional towers Mix and match modules Reconfigure anytime Reef-Safe & Built to Last Printed in reef-safe PETG No raw metal No exposed magnets Designed for long-term saltwater use Rigid construction that won’t collapse Important Notes These are extensions only A Starter Kit is required Parts only connect within the same size system Media not included Designed, manufactured, and shipped by Printed Reef