Plastiflex 1-1/2" x 200' Backwash Hose | LF500112200PI Discontinued 3" ID at both ends

3" ID at both ends confirms C-7470 is your correct match

Simplified dosing instructions

When measuring your existing partial grid

This difference does not affect fit or performance — the cartridge seals at the threaded top end cap and open bottom end cap

Plastiflex 1-1/2" x 200' Backwash Hose | LF500112200PI Discontinued 3" ID at both endsLay flat hoses or backwash hoses are swimming pool hoses with a flexible vinyl typically used by home owners and professionals to flush out sand or debris within the filters. Measures 1 1 2" by 200 feet long. Features and Benefits: UV and chemical resistant Roll up flat for easy storage