How often do I need to change my filter housing's o-ring?

Captain O-Ring's high quality replacement water filter housing o-rings are designed for reliable extended use. Still, it is typically recommended to replace your o-ring on every third filter change to ensure it is in top shape to prevent leaks.

Can I use grease or lubricant on these o-rings?

You can if you'd like to. Generally a brand new buna-n o-ring can be installed just with wetting it with water. However, these o-rings are compatible with all silicone and petroleum based lubricants, as well as natural oils like vegetable oil.

What if I don't know what o-ring part number my filter housing needs?

Use our handy printable water filter housing o-ring size chart. Print out the chart and lay your old o-ring on the page to see which o-ring it matches with. You can find the size chart listed as "User Guide [PDF]" under "Product guides and documents"

Are these o-rings safe for use in my drinking water?

Yes! These Captain O-Ring replacement o-rings are molded from NSF 61 certified buna-n rubber for safe and clean drinking water.

Where is this o-ring kit assembled?

Proudly assembled in the USA! We hand assemble these kits in Gloucester City, New Jersey.

Replacement 63597174c 63597174p Ao Wh Std Or 2 Wp252235 Orings

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

💧 Seal your water’s purity with confidence — don’t let leaks cramp your flow!

MADE IN THE USA - Hand-assembled in Gloucester City, NJ, ensuring top-tier craftsmanship and reliability.
PERFECT DIMENSIONS - 3.5" inside diameter x 3.75" outside diameter for a flawless, snug fit every time.
LEAK PROOF CONFIDENCE - Replace every 3rd filter change to maintain a perfect seal and avoid costly leaks.
UNIVERSAL COMPATIBILITY - Fits top brands like 3M Aqua-Pure, AO Smith, Watts & Project Source housings effortlessly.
PREMIUM NSF 61 BUNA N RUBBER - Certified safe for clean, healthy drinking water—no compromises on quality.

This 3-pack of replacement O-Rings from Captain O-Ring is engineered for select 3M Aqua-Pure, AO Smith, Watts, and Project Source water filter housings. Molded from NSF 61 certified buna-n rubber, these durable seals ensure leak-free, safe drinking water. With precise 3.5" ID and 3.75" OD dimensions, they fit perfectly and are recommended for replacement every third filter change. Proudly hand-assembled in the USA, these O-Rings combine trusted quality with universal compatibility to keep your filtration system running flawlessly.

Specifications

ASIN	B00T56QCCA
Best Sellers Rank	#148,495 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #60 in Faucet O-Rings
Brand	Captain O-Ring
Brand Name	Captain O-Ring
Color	Black
Customer Reviews	4.5 out of 5 stars 475 Reviews
Item Diameter	3.75 Inches
Manufacturer	Captain O-Ring LLC
Material	Rubber
Material Type	Rubber
Nominal Inside Diameter	3.5 Inches
Nominal Outside Diameter	3.75 Inches
Number of Pieces	3
Part Number	63597174C
UPC	701748961300
Unit Count	3.0 Count

Reviews

D**G

21.10.2025

B**I

29.05.2025

W**T

7.01.2021

A**S

28.04.2025

C**K

4.02.2025

A**Y

23.08.2025

A**R

21.06.2025

H**E

16.01.2024

K**R

3.10.2025

B**N

30.10.2025

R**R

19.10.2025

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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