When you order a water softener system from US Water,you will receive all necessary components for installation. However,we also provide all water softener parts individually. Would you rather have a stainless steel bypass instead of a plastic one? Would you like to upgrade your 15 inch brine tank to an 18 inch? Or maybe you just need to replace your water softener resin. We make it easy to find exactly what you need. Remember,if you have any questions about which parts to order,you can always talk directly with one of our water specialists at 1-800-608-8702.