How To: Replace the O-Ring on a Pool Sand Filter - YouTube
Amazon.com: 271104 Diverter & 271106 Sight Glass Gasket/Valve Top &Stem O- Ring Kit Replacement - for Pentair Pool Filter Valve Rebuild Kit PacFab 1 1/2" Top & Side Mount Multiport Valve : Patio,
Intex Replacement Parts for Pool Sand Filter Pumps, Air Release Valve and O- Rings 25013 - The Home Depot
Aqua EZ O-Ring Lubricant in the Pool Filter & Skimmer System Parts department at Lowes.com
Captain O-Ring - Replacement P6563 O-Ring for Bestway Flowclear 1000/1200/1500 Sand Filter Strainer Lid 2 Pack - Walmart.com