Stainless steel can last for decades; the rubber gaskets and seals that's a different story. So when the fittings, valves, and pumps are designed initially, they typically include a wearable part that will intentionally wear out faster. In addition, these components are manufactured to protect the more valuable stainless steel components. They are also essential in forming a seal for metal-to-metal joints where the rigid nature of the connection is. Eventually, these elastomers will need replacement so that the equipment can be in use for many more years. Without access to reliable replacement parts, equipment in breweries, wineries, and distilleries will end up spending a lot more money for replacing existing equipment.