Save with Auto-Ship

Get the product you need, exactly when you need it, delivered right to your door. No more searching for the right part number, we've got you covered. Plus, you'll save $$ on every order and shipping is on us. Learn more

Save Money

Free Shipping*

Choose Frequency

*Free Shipping available in the contiguous US

Rainsoft P-12 Under Sink Replacement Water Filter Cartridge by Tier1

Price $48.99 List Price Price $69.99 Save 30%
Availability: BackOrder - Free Shipping
  • Ships fast!
  • Installs quickly and easily
  • Reduces many common contaminants
  • Provides great tasting water at a great looking price
See more product details
The P-12 Rainsoft Under Sink Comparable Replacement Water Filter Cartridge by Tier1 installs quickly and easily, making it ideal for most under sink filtration applications. The US-WF0140 Tier1 Water Filter Replacement goes to work immediately after installation, actively reducing many common waterborne contaminants, ranging from rust to sediment. This product provides great tasting water at a great looking price. Order the P-12 Rainsoft Under Sink Comparable Replacement Water Filter Cartridge by Tier1 today!

Experience the Tier1 Difference

Tier1 manufactures high-quality filtration and household products. We take creating and maintaining a healthy home seriously. Products must undergo rigorous testing and meet demanding quality expectations in order to earn the Tier1 badge. Every purchase is backed by the Tier1® Guarantee:

  • Guaranteed Fit
  • Guaranteed Quality
  • Guaranteed Price
Package Qty1
Used In BrandsRainsoft, Tier1
Manufacturer's IdUS-WF0140
Actual Size (in)6 inches (length) x 4 1/2 inches (outside diameter)
Actual Size (cm)15.24 x 11.43
MediaCarbon Block
Primary Filter MediaActivated Carbon Block
Filter Life (months)6 months
Micron Rating (Nominal)10
Warranty GuaranteeUnconditional Product Guarantee for Life of the Product
Additional InformationOne Tier1 Carbon Block P-12 Replacement Filter Cartridge
Primary Filter MediaCarbon Block

Reduced Contaminants

The TIER1-US-WF0140 reduces the following contaminants:

  • Chlorine Taste & Odor
  • Dirt
  • Sand
  • Sediment
  • Silt

The TIER1-US-WF0140 is comparable with the following part numbers


The TIER1-US-WF0140 fits the following model numbers

9875 9878
9879 17561
17366 1319


  1. When taking the old filter out, make sure the threaded part of the housing cap is saved for installation of the new filter
  2. This 'nipple' may come off in the old filter when it is removed--DO NOT throw the 'nipple' away, it must be reused

Reset Instructions