The Rohl 4415-0330 is a brass tailpiece. This brass tailpiece is intended to convert the RMV-1 into a four-port valve for use with an external diverter. The Rohl 4782-1000 nut is needed to complete the package when ordering this 4415-0330. This Rohl 4415-0330 tailpiece is a representation of Rohl's commitment to making products that are easy for the customers to install and use. The House of Rohl has been in the business since 1983. They have reached success by providing distinctively different faucets and fixtures that define real luxury. To create superior products that will enhance your way of living is Rohl's goal. Here at PlumbersStock, we guarantee that you have access to the highest quality products and resources at very affordable prices. We pride ourselves in striving for excellence in every aspect of what we do.