If your water filter housing is dripping or not sealing right, chances are the o-ring is the culprit.

This Captain O-Ring set gives you three replacements for the Culligan OR-150 – a common size used in housings like the WH-S200-C, 3M Filtrete 3WH-STD-S01, and Glacier Bay HDG2VS4.

The o-ring measures roughly 3.75 inches inside diameter with a thickness of 0.14 inches.

Material is Buna-N (nitrile butadiene rubber) – it's flexible, resists tearing during installation, and holds up over time.

It's also NSF 61 certified, so it's safe for drinking water systems.

The rings come in a resealable zip-top bag with branded packaging, so you can store spares easily.

They recommend swapping the o-ring every third filter change to prevent leaks – cheap insurance against water damage.

One nice thing: these o-rings are high-quality enough that you usually don't need lubricant – just wet them with water before installing.

But if you prefer using lube, they're compatible with silicone-based, petroleum-based, or even vegetable oil.

Not sure which size you need?

There's a printable size chart available online – just lay your old o-ring on it to match up.