The Rohl R1085BO is a universal concealed thermostatic rough valve. It is from Rohl's Spa Shower collection. This thermostatic rough valve has service stops. It has a minimum distance of 4 1/2" and a maximum distance of 5 3/4" from the back of the valve to the finished wall. The flow rate should be 14 gallons per minute @ 60 psi. The extension kit for the Perrin and Rowe trims are included. Just cut for the desired length. If PEX is utilized, oversize the supply line to 1" for a full flow capacity. This thermostatic rough valve can be used with multiple product lines: Perrin and Rowe, Italian Country Bath, Palladian, Vincent, Michael Berman, Modern Lombardia, and Transitional Avanti. Must order the trim set to complete the package. Please see the specification sheet for more details. The Rohl R1085BO universal concealed thermostatic rough 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.