This Grundfos UPS3 Pump Plug is a genuine replacement plug for UPS3 circulators. With the product number 99436144, this plug is designed to fit perfectly and ensure that your water heater is functioning at its best. It is made with high-quality materials to ensure durability and longevity. As a storage tank water heater, this product is ideal for households that require a reliable and efficient water heating system. With the brand name Grundfos, you can trust in the quality and performance of this product. This pump plug is a necessary component for maintaining the proper functioning of your water heater, and we highly recommend it as a replacement part.