Captain O-Ring - Replacement 151122 O-Rings Compatible with Pentair Pentek Big Blue Water Filters OEM Size ORing Buna-N (3 Pack)

A perfect fit & NO LEAKS! They are a wee wee bit thinner but work just fine!

Perfect replacement.

Worked fine on my Pentek Big Blue filters. They are a bit thin, but do the job. I had a slight leak (only a drip) on one of the filters after installation, but that stopped after less than 24 hours as the o ring swelled a bit. Just a note that these o rings will swell after use. They will not fit back in the groove because the circumference increases and they will not lay flat in the groove. Always have new o rings on hand when you change your filter or it will be a frustrating experience.

O’ring fit perfect. First time canester ever screwed on the first time and no leak. Used small amount of silicone grease. I am extremely pleased

I seldom write a review however this one was easy to do. I normally reuse the o rings when changing out a filter in the big blue housing every 6 months. Last time I noticed the o ring was starting to get stretched out and didn’t fit perfectly I went ahead and installed it nonetheless hopefully it wouldn’t leak and it didn’t. Recently when it came time to change the filter again I ordered these new o rings hoping for a good fit. I was pleasantly surprised these o rings fit perfectly in the housing and made the reinstall very easy and confident it wouldn’t leak. I was too cheap to buy new o rings previously however they cost was worth it with an easier replacement and removed the concern of a leak.

There are a few reviews claiming the O-ring is too large for "big blue" type filter housings. Not so. Just like with the OEM rings, it takes a little work to get the ring fit into the channel in the housing. Install it right and it works.First, make sure the channel is clean. If the old O-ring isn't in it, and it didn't fall out on the floor when you removed the bottom of the big blue housing, it's still stuck in the top. Fish it out before you try to put the housing back together. Next, grease the new O-ring with petroleum jelly. No, not whatever exotic vegan sex lube the kids are using these days - plain old Vaseline. Push it into the channel in the housing. There will be a little "slack" to be pushed in. Work around the housing from 12 o-clock to 6 on both sides. The grease helps. No, that does not mean the O-ring doesn't fit properly. Once you have it seated, install new filter and screw back on. Don't forget to use the air purge when you slowly refill the housing.

easy to use

Why did you pick this product vs others?:It fit my big blue filter systemFit:grest