Can this faucet be connected to a water filtering system that uses 1/4" push-in fittings?
No it can't, it needs to be threaded.

This product is listed under the following manufacturer number(s):
*Denotes a finish or option that has been discontinued
No it can't, it needs to be threaded.
The Kohler Wellspring series only has cold only basin taps.
The Kohler K-6666 can fit decks up to 1 5/8" thick. This should be fine on it's own.
The Kohler K-6666 is designed as a drinking water faucet. We do have some that offer both hot a cold water. This would be an add on to your kitchen. Not for normal daily used as a kitchen faucet.
The Kohler K-6666 will work just fine with the Kohler K-3362-1 sink as it is a single hole installation and the K-6666 is a single hole faucet.
The Kohler K-6666 is not recommended for use with an RO system at all. They even mentioned that no Kohler faucet is recommended for use with an RO system.
The Kohler K-6666 can work with just about any filtration system. Th connections are the same. Thanks!
The Kohler K-6666 is compatible with K-200 systems only.
The Kohler K-6666 total height is 7-5/8", Spout height is 5-3/8" and the spout reach is 3".
| Spout Swivel | 360 |
|---|---|
| Faucet Holes | 1 |
| Spout Height | 7.63 |
| Handle Material | Metal |
| Faucet Centers | 0 |
| Low Lead Compliant | Yes |
| WaterSense Certified | No |
| Spout Reach | 3.00 |
| ADA | Yes |
| Theme | Traditional / Classic |
| Overall Width | 1.31 |
| Country Of Origin | USA |
| Max Deck Thickness | 2.00 |
| Valve Type | Ceramic Disc |
| Made in America | Yes |
| Flow Rate (GPM) | 1.60 |
| Escutcheon Included | No |
| Dispenser Type | Cold Only |
| Filtering | No |
| Eco Friendly | Yes |
| Faucet Body Width | 1.63 |
| Overall Height | 7.13 |
| Material | Brass |
| Handles Included | Yes |
| Installation Type | Deck Mounted |
| Handle Style | Lever |
| Number Of Handles | 1 |
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