Pentair StaRite S8M150 Inner System Filter Cartridge (25021-0202S) brominegenerators A union like this is

A union like this is useful where the plumbing needs a serviceable break point while still offering flexibility in how the downstream side is connected

and repeated opening

The CX1900RE is a practical service part when a compatible Hayward filter needs a cartridge to restore dependable filtration performance

use part number 360517 as the primary reference when checking fitment

Pentair StaRite S8M150 Inner System Filter Cartridge (25021-0202S) brominegenerators A union like this isThis replacement part supports a cleaner, more dependable service outcome when the existing component is worn, missing or difficult to reuse. Restoring filter media with the correct cartridge helps improve water clarity, flow rate and service efficiency. System 3 cartridge filters use matched inner and outer elements, so selecting the correct cartridge position and size is important. This replacement supports proper filtration balance inside the tank