The Waterway Fitting Package [Twin Pack] is a Waterway Plastics replacement component for compatible pool, spa, and bath equipment. It is useful for service repairs where the original part has become worn, damaged, missing, or difficult to operate, allowing the existing system to be maintained without unnecessary replacement of larger assemblies. Waterway components are commonly used across circulation, plumbing, jet, control, and filtration systems. Selecting the correct part number helps improve fitment, simplify installation, and support dependable equipment performance. This item is a practical choice for service professionals and homeowners completing focused repair or maintenance work. Replacement Waterway Plastics component, part 400-9900 Designed for compatible pool, spa, and bath equipment applications Helps restore fit, function, and serviceability Useful for repair work, maintenance, and equipment refresh projects Good option when the original component is worn, cracked, or missing