Dynamic Series IV-DFM, DFML, Waterway 35 In-Line Compatible Filter Cartridge filter-width_10 5/16 inches This is a Hayward ECX1009

This is a Hayward ECX1009 1/2 inch Bump Shaft for Perflex EC30

(1) Locking Ring

Choose from the following: 1/2 inch (Item DF-SF117)

While the old-style ratchet system is cumbersome and bulky

They will not over-stabilize the pool and they will not cause a reduction of ORP

Dynamic Series IV-DFM, DFML, Waterway 35 In-Line Compatible Filter Cartridge filter-width_10 5/16 inches This is a Hayward ECX1009The Hurricane HF4335 01 Cartridge Filter is compatible Dynamic Series IV DFM, DFML, Waterway 35 In Line, Guardian 409 219, and 03FIL1300, 17 2482, 25393, 303557, 817 3501, R173431 and other compatible models. It is identical to Pleatco PRB35 IN, Unicel C 4335, and Filbur FC 2385 filter cartridges. The original manufacturer's names and part numbers are for reference only. Hurricane's advanced point bond filter media has tighter filtration capabilities