The Rohl R1041R is a volume control rough-in valve with a clockwise opening. It is from Rohl's Shower collection. This rough-in valve has 1 inlet and 1 outlet. It has a minimum distance of 4" and a maximum distance of 4 1/2" from the back of the valve to the finished wall. The flow rate should be 16 gallons per minute. One extension kit is included. Just cut it to your desired length. It has a 3/4" NPT inlet and a 3/4" NPT outlet. This valve can be used with multiple product lines: Perrin and Rowe, Italian Country Bath, Palladian, Vincent, Michael Berman, and Modern Lombardia. Please see the specification sheet for more details. The Rohl R1041R volume control rough-in valve is covered by a limited lifetime warranty. It 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.