[2-Pack] Clarathon Dual-Stage Filters for EZ Spa2Go & Spa-n-a-Box - Comfort Line LGFPKWS Two-Pack LGFPKWS Premium quality cartridges Diameter: 4-1/4", Length: 8" - Top: 2" opening Bottom: 2" opening with black bypass filter Reemay no-clog filtration media (not paper like lesser brands) Fits Spa2Go and Comfortline Spas