This is a Maytronics KA50X20 – MTIL screw. It is used with many Dolphin cleaners.
Some of these models include the Deluxe, 3001, 2002, Heavy Duty, Enduro 11r/21r, Pro, Pro X, Pro X2, Commander, Sprite, Diagnostic Interactive, Orion II, Advantage RC, Explorer, DX4, DX5 Plus, DX5/DX6, Deluxe Cl1, Wave 10, Supreme M4/M5, Nautilus, 2002, DLX4/5, Wave 50, Apollo, Triton, Edge, 2×2 Gyro, Discovery, Wave 75, Liberty, Pentair Prowler 820/830, M3 (E55), Advantage Plus, Advantage Plus, 2×2, Wave 65, Wave 90, Bio, Deluxe 5 Trevi, Evolution X5, C3, C4, C5, 2×2 C6 Plus, M400, Oasis Z5, Nautilus, M200, Nautilus CC Plus, Triton Plus, Neptune Plus, and Edge.
