Description
Fits Housing
Slim 10″×2.5″
Volume Pricing
from $1.10
The replacement O-ring for slim 10″ × 2.5″ whole-house housings — the little rubber ring that’s doing the actual sealing between your housing cap and sump. Swap it out during service and stop leaks before they start.
What it does
The O-ring inside a whole-house filter housing is what actually keeps water from leaking between the cap and the sump. It’s rubber, so it’s a wear part: over time it can flatten from compression, dry out from age, take a nick from a rough cartridge change, or roll out of its groove during reassembly. Any of those and you get a slow drip — usually right when you can’t reach a plumber.
This is the standard 3 3/8″ O-ring for slim 10″ × 2.5″ whole-house housings with 3/4″ ports — the same size used on every MyWaterClub dual- and triple-stage system. Cheap insurance to keep on the shelf, and inexpensive enough to just swap in at every filter change so you never chase a leak.
Key benefits
- ✓Standard 3 3/8″ diameter O-ring for slim 10″ whole-house housings
- ✓Fits every MyWaterClub dual- and triple-stage whole-house system with 3/4″ ports
- ✓Works in blue and clear housings — same O-ring for both
- ✓Safe for potable water
- ✓Automatic quantity discounts — down to $1.10 each at 20+
Specifications
| O-Ring diameter |
3 3/8″ |
| Fits housing size |
Slim 10″ × 2.5″ |
| Port compatibility |
3/4″ |
| Application |
Dual & triple whole-house filter housings |
| Housing color |
Fits both blue and clear housings |
| Sold as |
Single O-ring (1 unit) |
| Dimensions |
4 × 4 × 1 in |
| Weight |
0.1 lbs |
| SKU |
GASKET34 (legacy: GASKET, ORING) |
Compatibility
✓ Works with
- All MyWaterClub dual- and triple-stage whole-house systems (3/4″ port, slim 10″ housings)
- Both blue and clear housings — same O-ring for both
- Standard slim housings with a 3 3/8″ O-ring groove (also fits RO Revolutions and many other brands)
× Not for
- Big Blue 10″ × 4.5″ or 20″ × 4.5″ housings (needs a larger O-ring)
- Housings with a 1″ port (typically larger O-ring size)
- RO membrane housings (different O-ring size and profile)
- Any housing where the groove diameter isn’t 3 3/8″ — measure yours if you’re unsure
Fits these MyWaterClub systems
Installer & plumber bulk pricing
Automatic quantity discounts kick in at 2 units and drop to
$1.10 each at 20+. Buying a case (100+)?
Contact us for case-quantity installer pricing.
Good to know before you buy
- Clean the O-ring groove before installing the new ring — wipe out any grit, hard-water scale, or old grease. Debris in the groove causes leaks even with a brand-new O-ring.
- Lightly lubricate the new O-ring with food-grade silicone grease before seating it. This helps it sit evenly in the groove and prevents rolling when you thread the sump back on.
- Do not use petroleum-based grease (Vaseline, WD-40, motor oil) — it degrades rubber and isn’t food-safe.
- Don’t over-tighten the sump. Hand-tight plus a quarter turn with the housing wrench is enough. Over-torquing squeezes the O-ring out of shape and shortens its life.
- Best practice: replace the O-ring at every filter change. At ~$1–$2 each, it’s the cheapest insurance against a leak — and O-rings degrade whether they’re leaking or not.
- If a housing keeps leaking after replacing the O-ring, inspect the groove and the housing lip for cracks or scoring — you may need a new housing.
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