SW-4 Wrench for #20 Big Blue Housings
Heavy-duty plastic wrench engineered to loosen standard 20-inch Big Blue filter sumps without cracking or stripping threads
Purpose-built leverage for standard Big Blue housings
Precision Fit Design
Molded specifically for Pentek #20 Big Blue sump dimensions, ensuring solid contact without slipping or damaging housing threads
High-Strength Plastic
Engineered polymer construction delivers the grip needed to break loose pressure-sealed sumps without the weight or rust issues of metal wrenches
Housing-Safe Material
Non-marring plastic protects sump exteriors and prevents the thread damage that can occur with pliers or improper tools
Universal Application
Works with Big Blue housings across residential, commercial, and industrial installations including drinking water, irrigation, and process filtration
Compatible filter housings
This Pentek SW-4 wrench (model 144368) fits all standard Pentek #20 Big Blue filter housings, including the 150237, 150238, 150470, 150471 series and equivalent 20-inch housings from other manufacturers that use the same sump diameter. Designed for use with housings that accommodate standard 20" x 4.5" filter cartridges in whole-house, point-of-entry, and commercial water treatment applications.
When you'll need this tool
Standard Filter Changes
Use the SW-4 wrench each time you replace sediment, carbon block, or specialty cartridges in your Big Blue housing to access the sump safely
Housing Inspection
Remove the sump to inspect O-rings, clean internal surfaces, or check for sediment buildup that could compromise filter performance
Irrigation & Process Systems
Open housings at the start and end of operating seasons for irrigation or industrial applications to verify system integrity
Prevents Damage
Eliminates the risk of cracked sumps or stripped threads from using pliers or adjustable wrenches
Faster Changes
Proper leverage means less time fighting with stuck housings during routine maintenance
Protect Your Investment
A simple tool that prevents costly housing replacements from improper removal techniques
Essential Accessory
Every Big Blue housing owner should have the correct wrench on hand for safe, effective maintenance
