Intermatic Timer Motor [WG433 20D] [208 277v] [Old Style] (WG433 20D) relayscontactors The Hayward SPX1094K skimmer weir The Hayward SPX1094K skimmer weir is designed for compatible SP1094 skimmer applications and helps regulate how surface water enters the skimmer throat A full DE grid helps create the primary filtration surface within a compatible diatomaceous earth filter assembly A properly selected Intermatic motor helps preserve voltage compatibility and contributes to more dependable automatic timing in older timer assemblies Timer motors are useful because they provide the movement that keeps a mechanical timer synchronized with its intended schedule