The Pentek 255600-43 is the correct filter replacement for the following:
The Pentek GS-10ALS-H-3/8" Inline Filter is part of the Pentek Gold Series Inline Filters. This 20 micron filter includes a pre-filter and a post-filter. Designed with Hexametaphosphate and coconut shell carbon construction, this inline water filter helps to remove scale, lime, chlorine taste and unpleasant odor in your drinking water. With a John Guest connection, this filter replacement cartridge is injection molded and pressure rated to 125 psi (8.62 bar).
Pentek Inline Water Filter Replacement specifications:
This Pentek inline filtration cartridge system is designed to be used on any point-of-use drinking water appliance that includes Reverse Osmosis (RO) systems, coffee makers, espresso brewers, distillation systems, ice machines, misters, water fountains, refrigerators food service equipment bottle-less water coolers and other drinking water dispensing devices.