The without-overlay configuration is practical when the correct overlay is already available separately or needs to be selected for the final setup
or visible damage from repeated use
or repairs where the existing collar is cracked
The Swimline filter connection hose is designed for compatible pool and filtration applications where a longer flexible connection is needed between system components
That continuity helps avoid confusion
Pentair PacFab TR40/50 Diffuser Assembly (154598) vacuumrelease The without-overlay configuration is practicalBuilt for focused service work, Pentair PacFab TR40 50 Diffuser Assembly is a direct replacement option for diffuser assembly used in TR40 and TR50 sand filters to spread incoming water across the media bed. It supports sand filter service where internal routing, media containment, and correct reassembly are important. Match by model, part number, size, color, and production date notes before ordering or installation. Confirm internal orientation