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

Pentek 20-ST Whole House Water Filter System

Price $77.99 List Price Price $110.99 Save 29%
Availability: In Stock
Choose a quantity
  • 1Filter$77.99 
  • 3Filters Price $73.38 each
  • 6Filters Price $70.19 each
The number 20 VIH Whole House Water Filter System 150166 is ideal for residential, commercial, and industrial water filter applications. The Valve-in-Head (VIH) patented technology allows for easy water filter cartridge replacement. The pressure release button on the cap allows for release of the whole house water filter pressure in order to more easily unscrew the sump from the cap. Whole house water filter housings extend the life of washing machines, water heaters, and other household appliances by reducing sediment before it reaches the appliances. The 20-inch standard whole house housings have thick walls for increased strength. The Valve-in-Head involves a simple half-turn of the shut-off valve in the cap to shut off the water supply when changing a water filter. No need to purchase additional shut-off valves (saves $10). Leaking and clogging is prevented by the dynamically sealing, self-cleaning o-ring. Connecting two number 20 Standard Housings: Two number 20 standard housings can be connected with a pipe nipple or pipe union. The union will allow for adjustment of the fitting in the event of leakage. NP-34: Use this pipe nipple to connect two number 20 Housings with 3/4-inch inlet/outlets. Reducing the 3/4-inch inlet/outlet of the number 20 Standard Housings--M3438: Use this pipe nipple to install the number 20 Housing on a 3/8-inch water line. The nipple reduces the 3/4-inch inlet/outlet on the housing to fit the 3/8-inch water line. M3412--Use this pipe nipple to install the number 20 Housing on a 1/2-inch water line. The nipple reduces the 3/4-inch inlet/outlet on the housing to fit the 1/2-inch water line.
Package Qty1
Used In BrandsPentek
Manufacturer's Id150166
Actual Size (in)22 5/8 inches (height) x 5 1/8 inches (width)
Actual Size (cm)57.4675 x 13.0175
Materials of ConstructionHousing: Polypropylene, Cap: Reinforced Polypropylene, O-Ring: Buna-N, Valve Parts: Delrin
Maximum Operating Pressure (psi)125
Maximum Temperature (°F)125
Flow Rate (gpm)8.00
Flow Rate (lpm)30.28
Fitting Size (inches)3/4 inch

Reduced Contaminants

The PENTEK-150166 is comparable with the following part numbers


Installation Guide

User Guide


  1. The 20 inch Valve-In-Head Whole House Water Filter System is easy to install
  2. The whole house system has 3/4-inch inlet/outlets for easy installation on the 3/4-inch main cold water line
  3. If you have a 1/2-inch water line, you can use a reducer nipple to reduce the inlet/outlet down to the 1/2-inch size