Hayward CX900F Filter Head O-Ring Replacement for Hayward Star-Clear Plus Cartridge Filter Series and Separation Tank

fit as advertised

Fit my Haywood filter head perfectly. Tight fit. I lubricated it with silicon jelly. No leaks

Could not return item

Worth the cost to provide great performance.

This is the second time I buy this. The first one I bought almost 5 years ago, and replaced it "just in case". They're cheap enough that you should probably replace them before they fail. I live in Arizona, so that gives you and idea of the abuse these o-rings can take: lots of heat, lots of pressure, and even below-freezing temps on occasion in the winter. This one did not arrive in OEM packaging, but in a plain shipping envelope with no wrapping or documentation of any kind. It looks like OEM and should hopefully last just as long, but it sells for a very reasonable price. Suggest you clean out the filter housing with plain water, a small toothbrush, and plenty of paper towels to ensure you get out all the dirt and contaminants, and old lube. While these o-rings last a few years, it's a good idea to clean them very well and re-lube them about once or twice a year to ensure optimal pump and filter operation. Suggest you use disposable glove(s) to lube it up with Hayward's Jack's Multilube (look it up on Amazon...it's a great product). It'll last a long time, just take care of it with good, and regular lubing.