Master Spas X320628 Twilight Series 4 Cup Holder Filter Lid, 18� x 13", 2010 2017 Skimmer Lids reliable operation of your pool 21071504863 reliable operation of your pool cover 🔄 Compatible With: Cover Pools undertrack automatic pool cover systems manufactured before 2015 using left hand glider assemblies 📦 Kit Includes: Rope (pre cut to correct length) Quick Attach Glider LH assembly Necessary hardware for installation 📋 Directions for Use: 1 ensuring optimal performance and ease of use dimensions or missing filter lid Restoring the look of your Twilight Series 4 spa Maintaining access to the filter area with a clean factory style finish 🚿 Keep your Master Spas hot tub looking and performing its best with the correct replacement lid for your Twilight Series 4 spa