Crystal Water 425 Square Foot Cartridge Filter - 2-1/2 Inch YGroup_smooth-ceramic-depth-markers creates a tight seal for

creates a tight seal for a 2-1/2 inch socket

see part number 1-100-5105O

The four inch castors are used on 5

It is 1/4 inch back mounted

Crystal Water 425 Square Foot Cartridge Filter - 2-1/2 Inch YGroup_smooth-ceramic-depth-markers creates a tight seal forThis Waterway Crystal Water Cartridge Filter is 425 square feet with 2 1 2 connections to maximize flow. Max residential flow for this model is 150 GPM. The 2 1 2 inch internals may be reduced for 2 or 1 1 2 inch piping. The Crystal Water Cartridge filters are the only filters on the market with 2 1 2 inch internal piping which improves flow and reduces system noise when using 2 1 2, 2 or 1 1 2 inch plumbing. The Crystal Water Cartridge Filters have a