The 3M CUNO DP2 6228503 is the correct assembly to use with the following cartridges:
The 3M CUNO - Dual Port Twin Manifold Assembly is a dual port twin manifold assembly. Also known as part number DP2 and 6228503, this CUNO Filter Manifold features dual port twin manifold assembly, series plumbed, shut-off valve, pressure gauge and "T" connection for Scale Inhibitor.
3M CUNO Water Filter Manifold Specifications:
Do not install this unit on a hot water supply line. The maximum operating temperature of this CUNO water filtration system is 100 degrees Fahrenheit (37.8 degrees Celsius). The disposable cartridge filter that is used with this assembly must be replaced every 12 months or if there is a noticeable reduction in flow rate.