Hot Tub Compatible With Cal Spas Round Weir WWP519-2089-DSGCompatible With Cal Spas Round Weir For Top Load Skim Filter WWP519 2089 DSG Compatible With Cal Spas Waterway Plastics Gray Round Weir For Twist Lock Top Load Skim Filter. 519 2080 This hot tub is designed to be compatible with the Cal Spas Round Weir WWP519 2089 DSG model. With precise engineering and high quality materials, you can trust that this hot tub will seamlessly integrate with your existing spa system. Say goodbye to compatibility issues