When replacing your pool filter cartridge, be sure to examine your pool filter tank O-Ring. Using an old, worn out O-Ring on a brand new cartridge doesn't make much sense. For as much money as you invest in replacing your filter cartridge, it's only logical to spend a few more dollars to ensure you get the most out of your investment. A pool filter tank O-Ring that has become flattened or stiff will reduce the effectiveness of your filter cartridge. So if you're already taking the time, making the effort and doling out the dollars to maintain your swimming pool filter, make sure you don't cut corners, especially on something as inexpensive as an O-Ring.
Remeber always lubricate your new o'ring with: Lube Tube
Super Star Clear Filter Tank O'ring (Duralon), DEX2400K C2000 o'ring, C3000 o'ring, C4000 o'ring, C5000 o'ring, o-429, 429, o429