Upgrade Guide Wheels and Pully Gears 3884997-R6 Replacement Parts for Maytronics Dolphin Nautilus CC Plus, Premier, M200, M400, M500, DX3, DX4, DX6 Pool Cleaner Part Number: 3884997-R6 Compatible with the Following Pool Cleaners: * Dolphin Nautilus (old model) * Dolphin Nautilus CC Plus * Dolphin Prowler 820 * Dolphin Prowler 830 * Dolphin M200 * Dolphin M400 * Dolphin M500 * Dolphin Wave 50 * Dolphin Wave 75 * Dolphin Wave 90 * Dolphin Wave 2 x 2 Gyro * Dolphin Quest * Dolphin Premier * Dolphin Apollo Plus * Dolphin Discovery * Dolphin Advantage Plus RC * Dolphin Advantage Plus Pro RC * Dolphin Deluxe 3 * Dolphin Deluxe 4 * Dolphin Deluxe 5 * Dolphin 2 x 2 * Dolphin 3001 * Dolphin HD * Dolphin PROX2 * Dolphin DX6 * Dolphin M4 * Dolphin M5 * Dolphin Edge * Dolphin Triton * Dolphin Orion * Dolphin C5 * Dolphin C6 Plus * Dolphin DLX 4 * Dolphin DLX 5 Package Included: 4 * Guide Wheels 2 * Pulley Gears