Tier1 Smart Tap Under-Sink Water Filtration System

Price $59.99
Availability: In stock
3/8-inch Quick Connect
  • This system has been tested against NSF/ANSI Standard 42, 53, an 401
  • Reduces Chlorine Taste and Odor, Lead, Mercury, and more!
  • Requires less space than most other under-sink water filtration systems
  • Features quick and easy installation
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The US-ST04 Tier1 Smart Tap under-sink water filtration system is a high performance under-sink system capable of filtering over 50 contaminants in your water. This system features a sleek design that minimizes the amount of space occupied for filtration needs, providing a nearly unnoticeable change from your usual under-sink storage decisions. Simple installation requirements are as easy as mounting the bracket under the sink cabinet and attaching the cold water supply with the supply adapter. Enjoy refreshing, great tasting water with the US-ST04 Tier1 under-sink Smart Tap Water Filtration System 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 Qty 1
Manufacturer's Id US-ST04
UPC 641945746853
Actual Size (in) 19.25 inches (length) x 4.125 inches (width) x 4.5 inches (depth)
Actual Size (cm) 50 centimeters (length) x 10.5 centimeters (width) x 11.5 centimeters (depth)
Primary Filter Media Carbon Block
Filter Life (gallons) 651
Filter Life (liters) 2464
Micron Rating (Nominal) 1
Operating Pressure (psi) 40 - 120
Operating Temperature (°F) 33 - 100
Operating Temperature (°C) 4.4 - 37.8
Flow Rate (gpm) 1.25
Flow Rate (lpm) 4.73
Fitting Size (inches) 3/8 inch
Color Gray
Chlorine Tolerance 95.5%
Certifications NSF/ANSI Standard 42, NSF/ANSI Standard 53, NSF/ANSI Standard 401
Includes System head with attachable bracket, smart tap filter, water supply adapter, mounting screws, 3/8 inch plastic tubing
Primary Filter Media Carbon Block

The TIER1-US-ST04 is comparable with the following part numbers



  1. Turn off cold water shut-off valve then turn on the kitchen faucet and allow water to drain from line.
  2. Disconnect the cold water line from the cold water shut-off valve
  3. Connect the water supply adapter to the cold water shut-off valve, as shown.

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