Southeastern2 Pack O-Ring Replacement for Pentair Rainbow 300/320 Chlorinator Lid O-Ring R172009 O-283

This O-Ring seems like a good quality item and fits perfectly in my Pentair model 320 chlorine feeder. Less expensive than pool supply store. (purchased one from a chain store that cost more and deteriorated within 4 months under normal use.)

At first, I thought these where not the right gaskets since initial installation did not seal the cap of the chlorine dispenser. When to a pool store and sure enough the gaskets where identical to the one sold at the pool store for double the price I would like to mention. Tried again and worked fine. User error the first go. Net is that 2 for the price of one compared to pool store, and it worked leads to a good buy.

Great price and worked and put perfect.

I put the first one in there and within 2 days, the o-ring deteriorated to the point where I couldn't unscrew the lid. When I did get it forced open, the o-ring had flattened and was in little pieces which were causing the friction preventing the lid from unscrewing. I used the same pool o-ring lubricant on it I've used on all my other o-rings over the years. Pulled out the 2nd 0-ring and the same thing.. but only I can't get the top off at all now. Nearly twisted the whole chlorine dispenser out of the pipes. I have no idea how to get it off now and will have to add chlorine manually until I can figure it out. These 0-rings fall apart at the mere thought of chlorine!

Fit my 10-year-old Rainbow Lifeguard 300 chlorinator just fine. This o-ring isn't quite as wide in cross-section as the original (the original o-ring had more of an oval cross-section,) but it seals the lid properly. The original o-ring lasted 10 years: time will tell if this one does.

Replaced the one that disintegrated on my Chlorinator 320. Was a good fit. Other reviewers mentioned to not crank the top of the Chlorinator shut. You don't need to do that to make a seal. You may end up damaging the o-ring if you do.

Perfect replacement at a fraction of the cost you would pay at a pool store.

Worked great. It’s possible the old o rings just needed lube, but at this price it was worth replacing at the same time.