Polaris Zodiac 3900 Drive Sprocket Assembly (R0547500) coverlifts and this Maytronics Dolphin 2x2

and this Maytronics Dolphin 2x2 black version uses the 99957049-ASSY reference

supporting safer heater operation and more dependable system performance

This type of part is especially useful when the original switch has become unreliable

The 7 x 30 inch size and six-required configuration give this part its practical value because DE filter elements work best when they match the original size and quantity relationship exactly

Replacement phenolic gear for compatible Stenner Series 45/100 pumps

Polaris Zodiac 3900 Drive Sprocket Assembly (R0547500) coverlifts and this Maytronics Dolphin 2x2Polaris Zodiac Drive Sprocket Assy [3900] is a replacement part for compatible Polaris and Zodiac pool cleaner systems. This component works with the cleaner drive system to help keep the unit moving across pool surfaces. When small cleaner parts wear out, even minor fit or movement issues can reduce cleaning coverage, create leaks, or cause the cleaner to move less reliably. Use part number R0547500 to help match this item to the correct cleaner